Joe Biden is still on top of the Democratic horserace, with 33% of the vote among Democrats. He is followed by Sanders at 18% and Warren at 15%. However, there are three important data points to keep in mind: (1) 60% of voters say they might still change their mind; (2) aside from Biden, majorities of voters think the other leading Democratic contenders are too far to the left; and (3) 60% of voters say they want to vote for a centrist candidate rather than someone more to the right of the left. If Hillary Clinton, John Kerry, or Mike Bloomberg jump in the race Hillary would be effectively tied with Biden among Democrats -- Biden 19%, Hillary 18%. Bloomberg would start at 6%.