Sen. Jim Webb's (D-Va.) retirement will make it tougher for Democrats to hold his seat, according to a former chairman of Virginia's Republican Party.

"Jim webb retirement good news for va gops. He was beatable, but less so than anyone else dems can field," Gillespie, the former chairman tweeted Wednesday.

Earlier Wednesday, Webb announced he would not seek reelection in 2012. Former Sen. George Allen (R-Va.) had already announced his candidacy for the seat and, for the moment, Virginia Democrats are without a clear nominee, but they say they plan on fielding a strong Democrat to succeed Webb. On the Republican side, Allen is expected to face a primary opponent.

Webb is one of three senators who caucus with the Democrats who will retire after this term. Sen. Kent Conrad (D-N.D.) and Sen. Joe Lieberman (I-Conn.) are the others.