Barrow trounced Thomas by more than 50 points last cycle despite the fact that he was attacked by a liberal political action committee during the primary for being too conservative on issues like tax cuts and the Iraq War.
Barrow is white and Thomas is black and she represented the Savannah area in the Georgia General Assembly for a dozen years. The district is about 44 percent black, meaning the primary electorate will likely be majority black.
Barrow was buoyed last cycle by the endorsement of several prominent local black leaders and then-Sen. Barack Obama (Ill.). The primary is scheduled for July.
CQ Politics currently rates the 12th district general election contest Likely Democratic.
*To see how all the 2010 Senate races are shaping up, check out the CQ Politics election map.*