Poll Shows Romney Leading Santorum In Pennsylvania

Three weeks before the Pennsylvania Republican primary, a state poll shows Mitt Romney leading Rick Santorum by five percentage points.

Mitt Romney speaks at a Washington luncheon hosted by the Newspaper Assn. of America and the American Society of Newspaper Editors.

HARRISBURG, Penn. -- Three weeks before the Pennsylvania Republican primary, a state poll shows Mitt Romney leading Rick Santorum by five percentage points.

Santorum, who trails Romney by hundreds of delegates, has acknowledged that Pennsylvania is a must-win for his campaign. Santorum represented the state in Congress from 1991-2007.

Here's the breakdown from the Public Policy Polling survey:

Mitt Romney: 42

Rick Santorum: 37

Ron Paul: 9

Newt Gingrich: 6

Last month, Romney polled at just 25 percent to Santorum's 43 percent in Pennsylvania, a positive swing of 17 percentage points for Romney.

"The momentum in Pennsylvania is moving completely against Rick Santorum," said Dean Debnam, president of Public Policy Polling, a Democratic firm.

The survey of 402 likely Republican voters in Pennsylvania has a margin of error of plus or minus 4.9 percentage points.