Kennedy endorsed Senator John Kerry for the 2004 Democratic presidential nomination in September 2003, and served as an advisor to the Kerry campaign. She sometimes was mentioned as a possible nominee for Secretary of Defense in a Kerry administration. She endorsed military veteran candidates Eric Massa and Patrick Murphy in 2006. In 2007 and 2008 she endorsed Senator Hillary Clinton and Senator Barack Obama in their respective campaigns for the presidency. She was discussed as a potential vice presidential choice for the Democratic presidential nominee, Barack Obama.