Given a document, find the main entity about whom the author is writing. Write the full name if mentioned in the text. Note that URLs in the text have been replaced with [Link].
--------
Question: SACRAMENTO  Calif. (Reuters) -  A California neuroscientist vying to unseat Republican Congressman Dana Rohrabacher  stepped up  his  criticism of the conservative on Tuesday  demanding  he  return a $1 000 contribution from indicted Trump adviser Paul Manafort.
FILE PHOTO:  Republican U.S. Representative Dana Rohrabacher  speaks at a news conference in Moscow  Russia on June 2  2013. REUTERS/Maxim Shemetov/File Photo
The Orange County seat held by  Rohrabacher  is key to Democratsâ hopes to increase their numbers in the U.S. House of Representatives in next yearâs elections. Neuroscientist Hans Keirstead  a stem cell researcher and entrepreneur from Laguna Beach  is one of seven Democrats aiming to beat him  according to the Federal Election Commission.
 Rohrabacher   a senior member of the House Committee on Foreign Affairs  has frequently praised Russian President Vladimir Putin and was considered for a role in U.S. President Donald Trumpâs cabinet.
FILE PHOTO: U.S. Rep. Dana Rohrabacher (R-CA) speaks during a House Foreign Affairs Europe  Eurasia and Emerging Threats Subcommittee hearing about the attack on demonstrators by members of Turkish President Recep Tayyip Erdogan's security detail on Capitol Hill in Washington  DC  U.S. on May 25  2017. REUTERS/Aaron P. Bernstein/File Photo

Answer: Dana Rohrabacher


Question: Former President George W. Bush has been widely praised for yesterday 's speech at the Dallas police memorial and especially for a quote which has been widely shared on social media . 
Many people on Twitter found themselves almost shocked that they were so impressed by Mr Bush . 
Michael Beckman , who described himself as a ` Jewish conservative Republican ' tweeted : ` President George W. Bush gave a beautiful speech today . 
Many people searched the internet to see if Mr Bush had plagiarized it from another source . 
Former President George W Bush speaks at Dallas memorial . 
Houston radio host Matt Patrick tweeted today : ` Loved George W. Bush 's speech yesterday ! 
Time magazine published Bush 's entire speech but it was that particular passage which was seen by many Americans as a touchstone for their feelings . 
Twitter user Jacob Boos claimed Bush 's speech was better than Obama 's and added : ` Then again probably not he has an agenda to push . ' 
But most thought that whoever had written his speech deserved great credit , as did Bush himself , for delivering it with warmth and sincerity . 
Mr Bush said : ` These slain officers were "the best among us" .

Answer: George W Bush


Question: Call it a good news-bad news scenario for  Gus Kenworthy .
 The outspoken freestyle skier  broke  his  thumb in training on Thursday.
 He  tweeted out a picture of  his  X-Ray  along with one of  his  freshly casted hand and included this quip: "It won't stop me from competing (obvi) but it does prevent me from shaking Pence's hand so ... Silver linings! "
 Kenworthy  has previously said  he  would not go to the White House as part of the traditional visit the U.S. Olympic team makes after the Olympics.

Answer:
Gus Kenworthy


