Attention is turning to Democratic Senator John Kerry as the leading contender for secretary of state after U.S. Ambassador to the United Nations Susan Rice took herself out of the running for the position.
John Kerry waves as he walks to the podium to address the Democratic National Convention in Charlotte, North Carolina, September 6, 2012.
Barack Obama works the crowd during his first presidential campaign with John Kerry, during a rally at the College of Charleston campus in South Carolina, where Kerry endorsed Mr. Obama, January 10, 2008.
Then-Democratic presidential candidate John Kerry points toward the audience beside his wife Teresa Heinz Kerry after the presidential debate in Tempe, Arizona, October 13, 2004.
Then President George W. Bush and John Kerry greet each other at the end of their first presidential debate at the University of Miami in Coral Gables, Florida, September 30, 2004.
John Kerry windsurfs off the coast of Nantucket, Massachusetts when he was the Democratic presidential candidate, August 30, 2004.
Democratic presidential candidate John Kerry along with his wife Teresa Heinz Kerry greet supporters during a fundraiser when he was the Democratic presidential candidate in Boston, Massachusetts, 2003.
Senator John Kerry is swarmed by supporters as he arrives for a re-election victory rally in Boston, Massachusetts, November 5, 1996.
John Kerry raises his arms in victory in this November 6, 1984 photo in a Boston hotel where he celebrated his defeat over Ray Shamie, in the Senate race.