ABC News' Teddy Davis reports: A second party switcher has now gone down to defeat. Alabama Congressman Parker Griffith, a Democrat-turned-Republican, was soundly defeated in Tuesday's GOP primary. In the wake of Pennsylvania Sen. Arlen Specter's defeat, Griffith is now the second party switcher to lose an intraparty fight this election year. With 99 percent of precincts reporting, Madison County Commissioner Mo Brooks had 51 percent of the vote to Griffith's 33 percent and 16 percent for Les Phillip. Griffith, who had originally been elected as a Democrat, switched parties last year. House GOP leaders promised that they would back him. Griffith struggled, however, to persuade rank and file Republican primary voters that his switch was about more than political opportunism. Griffith joins Rep. Alan Mollohan, D-W.Va., as House members to lose their re-nomination bids so far this year. In the Senate, Specter as well as Utah Sen. Bob Bennett, R, have come up short in intraparty battles. Arkansas Sen. Blanche Lincoln, D, is potentially a third Senator who might not receive her party's nomination for an additional term. She faces a runoff on June 8 against Democratic Lt. Gov. Bill Halter.