(CNN) - Barack Obama's once double-digit lead over John McCain in a hypothetical match-up has evaporated, according to a just released Associated Press poll.
Both Hillary Clinton and Barack Obama are now statistically tied with McCain, suggesting the Arizona senator may be benefiting from the drawn out Democratic primary race.
In the latest survey, Clinton holds a 48-45 percent lead over McCain while Obama and McCain are even at 45 percent. Factoring the poll's 3 point margin of error, both Democrats are even with the presumptive Republican nominee.
But in an AP poll conducted last February, Obama held a 51-41 percent advantage to McCain. Clinton's lead over McCain was also outside the margin of error, 48-43 percent.
A key reason for McCain's rise is the apparent divisions between supporters of Obama and Clinton. Close to a quarter of Obama supporters reported they will back McCain if the Illinois senator fails to get the nomination, while a third of Clinton backers said they'd vote Republican if Obama is the Democratic nominee.
"Among other things, this poll shows that the extended fight for the Democratic nomination is starting to take a toll on the party's prospects in November," said Alan Silverleib, CNN Senior Political Researcher. "The divide between supporters of Clinton and Obama is growing, and the big winner is John McCain."
Speaking to reporters Thursday, Democratic National Committee Chairman Howard Dean said he's not worried these divisions will hold up.
"All polls right now are worthless until after Labor Day," he said, adding, "It's not a phenomenon we’re worried about."