One might ask the same question about Newt's endorsement of Dede Scozzafava.
Santorum had several reasons to endorse Specter, although I thought it was a big mistake. First, Bush and Rove leaned on him, hard, and said that Specter was more electable, and would help Bush confirm good SCOTUS candidates in the Senate. I doubted that, but in fact he did, before he went around the bend.
Second, Specter had endorsed Santorum in earlier elections, although he did nothing to help him in 2006.
What was Newt's excuse for endorsing Scozzafava? Without that endorsement, the Conservative probably would have won. Scozzafava had little chance of winning, but instead dropped out and handed it to the Democrat. Without all those attacks by the RNC and Newt on the Conservative, he would have won the seat.
Frankly, it would be more to the point if Ron Paul would drop out, but I'm afraid he never will. He enjoys being destructive.
The Newt supporters still have not gave me a answer of how can Pat Toomey being a conservative support the repeal of the ban in the military of Don’t Ask, Don’t tell, and voted on the repeal of the ban in the military of sodomy and bestiality.... I never have gotten a answer back from he Newt support of this... I wonder why ? perhaps ? if they repeat a lie often enough people will believe it.