Sen. Hillary Clinton has widened her lead over Sen. Barack Obama in the Pennsylvania Democratic presidential primary battle, according to a Quinnipiac University poll released today.

Sen. Clinton now leads Sen. Obama, 53 to 41 percent among likely primary voters, the poll said. This compares to a 49 to 43 percent Sen. Clinton lead in a Feb. 27 poll. In that survey, the momentum was with Sen. Obama, who had narrowed a 52 to 36 percent gap from a Feb. 14 poll.

In the latest survey, the split between black and white voters has grown. Sen. Clinton has widened her lead among women likely Democratic primary voters and narrowed Sen. Obama's lead among men.

• White voters go with Sen. Clinton 61 to 33 percent, compared to 56 to 37 percent Feb. 27.

• Black voters back Sen. Obama 76 - 18 percent, compared to 69 - 23 percent Feb. 27.

• Women back Sen. Clinton 59 to 35 percent.

• Men go 48 percent for Sen. Obama to 45 percent for Sen. Clinton, compared to Feb. 27 when men backed him, 50 to 43 percent.

• Sen. Obama gets 50 percent of Democrats with a college degree, to Sen. Clinton's 45 percent.

• Among voters with no college degree, Sen. Clinton leads 57 to 37 percent.

• Voters younger than 45 back Sen. Obama, 57 to 39 percent while voters older than 45 back Sen. Clinton, 60 to 34 percent.

"The momentum is clearly Sen. Clinton's as she firms up her traditional coalition of women, white males, non-college, rural and older voters in Pennsylvania," said Clay F. Richards, assistant director of the Quinnipiac University Polling Institute. "Her endorsement by Philadelphia's black Mayor, Michael Nutter, is cutting slightly into Obama's overwhelming edge among black voters, but clearly the split among black and white voters is growing."