From Public Policy Polling: The Democratic nomination (in 2016) at this point is Hillary Clinton’s for the taking if she wants it. She has an amazing 86/10 favorability rating with Democratic voters. In a dream field Clinton gets 57% to 14 for Joe Biden, 6% for Elizabeth Warren, 5% for Andrew Cuomo, 3% for Russ Feingold, 2% for Mark Warner, and 1% each for Martin O’Malley and Brian Schweitzer.
Clinton’s appeal to the various different constituencies of the Democratic Party is pretty universal. She’s at 58% with ‘very liberal’ voters, 56% with moderates, 60% with women, 52% with men, 59% with whites, 54% with African Americans, 51% with Hispanics, 64% with seniors, and 44% with young voters.