Keller is a prime target, organizers say, because of his House speech last week comparing the Iraq war with a neighbor's unkempt lawn. "Imagine that you have a next-door neighbor who refuses to mow his lawn, and the weeds are up to his waist," Keller said. "You mow his lawn for him every single week. The neighbor never says thank you, he hates you and sometimes he takes out a gun and shoots at you. Under these circumstances, would you keep mowing his lawn forever?"

"The Iraq issue transcends partisan politics," Barnett said. "Keller may be a rock-ribbed conservative but on the biggest issue of our day, he's got it wrong."

[T]he Victory Caucus hopes to shame Republicans into sticking with their leaders on upcoming votes on defense spending. "This is a means of getting out a message," said Dean Barnett, a member of the Victory Caucus Board of Governors. "We're letting the political class know there's a huge chunk of people out there that want victory."

Liberal bloggers have already been involved in several high-profile primary battles with limited success. They helped Ned Lamont topple Sen. Joseph I. Lieberman in the Democratic primary, but he lost in the general election and Lieberman was elected as an independent.

They also were unsuccessful when Democrat Ciro Rodriguez fell short in his primary challenge against Rep. Henry Cuellar, D-Texas. Later, Rodriguez came back to defeat Republican Rep. Henry Bonilla in a December special election.