Washington (AP) The sometimes bitter primary fight is souring many backers of Hillary Rodham Clinton and Barack Obama on the rival candidate.

An Associated Press-Yahoo poll that's tracked the same 2,000 democrats since November finds they increasingly dislike the contender they're not supporting, signaling potential trouble for the general election.

Obama supporters with negative views of the New York senator have grown from 35 percent in November to 44 percent this month, including one-quarter with very unfavorable feelings.

As for Clinton supporters, those with unfavorable views of Obama have grown from 26 percent to 42 percent during this same period, including a doubling to 20 percent of those with very negative opinions.