FOX News

In April 2004, Sen. Arlen Specter narrowly beat the challenge of an upstart conservative congressman, Pat Toomey, in the Republican primary on the way to winning a fifth term against Democrat Joe Hoeffel.

In May 2010, Sen. Specter finds himself, as a defector from his old party, in a hard fight to beat another congressman, Joe Sestak, for the Democratic nomination. And to many Republicans -- as evidenced by the campaign contributions that have swelled his coffers -- Pat Toomey, who almost did it when the political planets were not so favorably aligned, is the natural choice to be the Republican nominee.