For the third week in a row, a Quinnipiac University poll shows New York Sen. Hillary Clinton with a solid lead in Pennsylvania over Illinois Sen. Barack Obama.

In a poll of 1,027 likely Democratic voters conducted Friday through Sunday, Clinton led Obama by a 51 percent to 44 percent margin, up a point from 50-44 last week.

White voters back Clinton 57 percent to 38 percent, while blacks back Obama 84 to 10 percent, the Quinnipiac poll found.

Women back Clinton 57 percent to 38 percent, while men are for Obama 53 percent to 42 percent; white Catholics are for Clinton 66 percent to 29 percent; voters under 45 go with Obama 57 percent to 41 percent, while older voters back Clinton 54 percent to 40 percent.

"Pennsylvania voters apparently made up their minds a couple of weeks ago, and nothing has happened since to change them. An extraordinary turnout effort by Sen. Barack Obama's campaign could snatch this victory from Sen. Hillary Clinton, but that does not appear likely," said Clay F. Richards, assistant director of the Quinnipiac University Polling Institute.

"Sen. Obama got off message after his 'bitter' remarks and never regained his momentum, giving Clinton the opening to fight another day in Indiana and North Carolina. She wins in Western Pennsylvania; he wins in the East. She gets Catholics, white women and blue-collar labor vote. He captures men, blacks and college grads - and enough delegates to keep his edge in the number that counts most."