A political action committee (PAC) launched by liberal bloggers made its first endorsement Monday of a primary challenger to Sen. Blanche Lincoln (D-Ark.).

Accountability Now, the PAC founded in 2008 by firedoglake's Jane Hamsher and Salon's Glenn Greenwald to goad incumbent Democrats into maintaining party principles, endorsed Arkansas Lt. Gov. Bill Halter (D), who announced on Monday a primary challenge to Lincoln.

"As the head of the Agriculture Committee and a member of the Finance Committee, Blanche Lincoln has stood at the front of the line when it comes to repaying her corporate donors with political favors," Hamsher said in a statement. "Lincoln has personally been the recipient of big ag subsidies, and her continued tenure as Chairman of the Senate Agriculture Committee would mean the death of sustainable agriculture for a generation.  She's the prime target for an accountability campaign."

Democrats have griped over Lincoln's centrist record over the past year, especially on issues like healthcare reform and climate change legislation.

Accountability Now had sought to encourage Halter to get into the race, launching a "Draft Halter" website and campaign earlier this year. Halter's decision to get into the race is arguably the first visible victory for the newly-formed group.

Accountability Now had about $9,649 in cash on hand at the end of 2009, according to Federal Election Commission (FEC) filings, though it had disbursed just under $210,000 last year.

"We are delighted that our efforts to draft Bill Halter and organize institutional support for his campaign led to his decision to enter the race," Hamsher added. "We look forward to working with the groups in Accountability Now and the people of Arkansas to support him in this race and to see him sworn in as the next Senator from Arkansas."