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(CNN) Ted Cruz formally named Carly Fiorina as his vice presidential running mate Wednesday -- a last-ditch move to regain momentum after being mathematically eliminated from winning the GOP presidential nomination outright. 
  
 "After a great deal of consideration and prayer, I have come to the conclusion that if I am nominated to be president of the United States that I will run on a ticket with my vice presidential nominee Carly Fiorina," Cruz said during a rally in Indianapolis. 
  
 Fiorina joined the Texas senator on stage, and Cruz's staff changed the podium in between Cruz and Fiorina's remarks to display a new logo featuring both their names. 
  
 "Ted could not be more right in what he said: There is a lot at stake, and in fact, this is a fight, this is a fight for the soul of our party and the future of our nation," Fiorina said. "I've had tough fights all my life. Tough fights don't worry me a bit." 
  
 Fiorina told CNN in an interview the "real formal final conversation" between the two of them regarding the vice presidential decision happened Tuesday. 
  
 "Everything about this campaign, everything about this election, is unprecedented," Fiorina said. "Let's face it, these are unprecedented times, we face unprecedented challenges and dangers. I think this is a confident leader who knows what he wants to do for this nation and who wants the nation to understand who he is, what he believes and who he wants by his side to fight this fight on behalf of the American people." 
  
 Cruz is trying to recapture the narrative and keep himself relevant after Trump seized momentum in the 2016 race with a sweep of all five East Coast states on Tuesday, which puts him closer to having enough delegates to win the Republican nomination. The unusual move from the Cruz campaign also comes just hours after the billionaire businessman, who is trying to look like the presumptive nominee, gave a high-profile scripted speech on foreign policy. 
  
 Indiana votes Tuesday in the next GOP contest. Cruz must have a strong showing in the Hoosier State to help block Trump from securing the 1,237 delegates necessary to win the nomination, and keep alive his hopes of a contested Republican National Convention 
  
 During her remarks Wednesday, Fiorina described how she had grown close to the Cruz family since endorsing his presidential bid, including singing a few bars from an original song describing her affection for Cruz's daughters. 
  
 "I have watched Ted and Heidi: They are partners, they're a couple that rely on each other," Fiorina said. 
  
 JUST WATCHED Cruz is vetting VP candidates, including Fiorina Replay More Videos ... MUST WATCH Cruz is vetting VP candidates, including Fiorina 05:10 
  
 Trump responded to the news of Fiorina's selection in typical fashion -- using a tweet, which featured a clip of Fiorina criticizing Cruz on CNN earlier this year. 
  
 "Ted Cruz is just like any other politician; he says whatever he needs to say to get elected," Fiorina says in the four-second clip. Trump's tweet included the caption, "Agreed!" 
  
 Trump later called the pick "a desperate attempt to save a failing campaign by an all talk, no action politician." 
  
 "The people of Indiana are very smart -- they will see through this just like they saw through the already failed Kasich alliance," Trump said in a statement. "Cruz has no path to victory -- he is only trying to stay relevant." 
  
 Fiorina built her ill-fated presidential bid around her business experience as former president of Hewlett-Packard, a company she led from 1999 to 2005. She also ran for Senate in California in 2010 against Democrat Barbara Boxer. But during her tenure at HP, she led a divisive merger with Compaq and criticism of her leadership of the company was a key focus of Boxer's effective campaign against Fiorina. 
  
 Fiorina frequently sparred with Trump during the primary. Trump was quoted in a Rolling Stone profile as complaining about Fiorina's looks when she appeared on the television he was watching, saying, "Look at that face!" 
  
 Trump later argued he was referring to her "persona." 
  
 She turned the attack into an asset, calmly responding to Trump during a CNN Republican debate, that she believed "every woman" in America knew what Trump was referring to in his Rolling Stone comments. 
  
 Cruz referenced the incident during his comments Wednesday. 
  
 "I have seen her day in, day out, on the campaign bus, going from stop to stop to stop that she is careful, she is measured, she is serious, she doesn't get overly excited, she doesn't get rattled by whatever is thrown at her," Cruz said. "And you know, we all saw that when in one of the earliest debates, Carly confronted Donald Trump, a man who in his characteristic understatement said of her: 'Look at that face.'" 
  
 Fiorina revived her attack of Trump in her interview with CNN, referencing comments the billionaire said Tuesday night claiming Hillary Clinton would not be doing as well if she were not a woman. 
  
 "Look, I disagree with Hillary Clinton on every issue," Fiorina said. "That is why she cannot be president of the United States. I am very proud to be a woman. But I would never ask people to vote for me because I'm a woman. Ted Cruz didn't pick me because I'm a woman, Ted Cruz picked me because I'm a capable individual. Donald Trump's comments on women are frequently things I find either irrelevant or offensive." 
  
 Typically, candidates do not name vice presidential picks until after they are the presumptive nominee and soon before the convention. But Cruz is pinning his hopes on a contested GOP convention -- and after a disastrous two weeks of Northeast contests where Cruz netted just five delegates. 
  
 Fiorina also spent much of her time on the trail attacking Democratic front-runner Clinton, drawing a contrast with the former secretary of state as the only woman on the Republican side. Cruz has highlighted that tactic on the trail with Fiorina, saying Clinton would be terrified of Fiorina. 
  
 Vice presidential speculation heated up this week after Cruz confirmed his campaign was vetting Fiorina as a running mate. Fiorina is well-liked by Cruz's staff and has campaigned with him more than any other surrogate, and has spoken for him with reporters. ||||| poster="http://v.politico.com/images/1155968404/201604/1213/1155968404_4866139893001_4866010817001-vs.jpg?pubId=1155968404" true Cruz names Fiorina as VP running mate Hoping to kickstart his campaign after a string of demoralizing losses to Trump, the senator is tapping a former rival turned loyal campaign surrogate. 
  
 Ted Cruz announced Wednesday that Carly Fiorina will be his vice presidential nominee if he’s the Republican Party’s pick for president. 
  
 If nominated, "I will run on a ticket with my vice-presidential nominee, Carly Fiorina," the Texas senator said at an Indiana rally before the crowd began chanting "Carly." 
  
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 The two appeared together in an hour-long event in Indianapolis, with Cruz alternating between lauding Fiorina and maintaining that he has a path forward in the race despite suffering a series of losses over the last two weeks. Fiorina, who followed Cruz, shared stories about her own background and about Cruz, and even sang to his two young daughters from the stage, as she also railed against Donald Trump and Hillary Clinton. 
  
 Fiorina, a former Hewlett-Packard CEO, has been among Cruz’s most loyal and active surrogates since she ended her own 2016 GOP presidential bid after a poor finish in New Hampshire in February. 
  
 "This is a fight worth having," Fiorina said. "This is a fight worth winning. With your help, we will win this fight." 
  
 The announcement, which was teased early Wednesday morning, comes the day after Cruz suffered a drubbing at the hands of Trump in five northeastern primaries — losses that mathematically eliminated Cruz from getting the 1,237 delegates he’d need to clinch the GOP nomination. 
  
 "I'm not getting to 1,237 delegates, and Donald J. Trump is not getting to 1,237 delegates," Cruz said. "And the Hoosier state is going to have a powerful voice in making that clear." 
  
 Cruz’s hopes now rest in a contested convention this summer in Cleveland, where the Texas senator would hope to stop Trump on the first ballot and then win in subsequent rounds of voting thanks to support from the loyal delegates his campaign has assiduously courted. 
  
 Fiorina will work with Cruz, she said, "to restore the soul of our party, to defeat Donald Trump, to defeat Hillary Clinton and to take our country back." 
  
 The Cruz campaign deliberated over whether to pick Fiorina for the last two weeks, according to one person familiar with the move. It has polled the potential ticket, examining it for its prospective strengths and weaknesses. 
  
 The hope within the campaign is that Fiorina will help Cruz in California, which will award 172 delegates on June 7. Fiorina is scheduled to give the keynote address at this weekend’s California Republican Party convention, speaking hours after Cruz takes the stage. 
  
 She delivered a wide-ranging speech on Wednesday that highlighted Cruz's embrace of conservative principles and of the Constitution, but she also aimed to highlight a softer side of Cruz, describing time spent on the campaign bus with him and noting how much his daughters "adore their dad." She sang several bars of a song to his daughters 
  
 "I know two girls that I just adore," Fiorina sang. "I'm so happy I can see them more. 'Cause we travel on the bus all day...we get to play." 
  
 The move to bring Fiorina on board comes at a time of growing desperation within Cruz circles. Some in the campaign worry that the Texas senator will lose Indiana on Tuesday and lose other key states in May, paving the way for a Trump nomination. 
  
 Cruz is campaigning fervently this week in Indiana, where primary rules award the winner most of the state’s 57 delegates. With Trump’s victories Tuesday night, and with most of Pennsylvania’s 54 unbound delegates leaning in Trump’s direction, Cruz needs success in Indiana and California if he has any hope of stopping Trump. 
  
 The most recent Indiana polls show Trump polling around 40 percent, between 5 and 8 percentage points ahead of Cruz. Those polls were conducted before Ohio Gov. John Kasich — who’s polling around 20 percent in the state — announced that he would no longer actively campaign in Indiana, in exchange for Cruz agreeing to no longer actively campaign in Oregon and New Mexico. 
  
 Kyle Cheney and Patrick Reis contributed. 
  
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Output:
Ted Cruz's big 4pm announcement? As sources told Politico in advance that he would, he named Carly Fiorina as his vice presidential running mate. "After a great deal of consideration and prayer, I have come to the conclusion that if I am nominated to be president of the United States that I will run on a ticket with my vice presidential nominee Carly Fiorina," Cruz said, per CNN. Politico calls Fiorina one of "Cruz's most loyal and active surrogates" since she ended her own presidential bid. Cruz made the announcement in Indiana, where he's campaigning this week in advance of Tuesday's primary.