Presumptive Democratic presidential candidate Barack Obama answers questions from the audience during a town hall meeting as he campaigns at Kaukauwa High School in Kaukauna, Wisconsin June 12, 2008. (Xinhua/Reuters Photo)

A latest survey showed presumptive Democratic presidential candidate Sen. Barack Obama has taken an early lead over his Republican counterpart Sen. John McCain in the crucial swing states of Ohio, Pennsylvania and Florida.

According to the survey posted on Quinnipiac University's website Wednesday, Obama is ahead 47 percent to 43 percnet in Florida, 48 percenrt to 42 percent in Ohio and 52 percent to 40 percent in Pennsylvania.

The Quinnipiac polls showed Obama solidly leads McCain in the three states among women, while the fight to win the support of white men is too close to call.

Obama trails McCain among white voters in Florida and Ohio, but is supported by more than nine out of 10 African Americans.

Obama also is running up double-digit leads among young voters in each state.