There are lots of signs that Republicans are a party divided. But Democrats have their own widening cracks -- and that could make a potentially bleak election year even tougher.
Arkansas Sen. Blanche Lincoln is the latest Democratic incumbent to attract a primary challenger. Anti-abortion Democrats are fighting hard to derail President Barack Obama's health care plan. Some civil rights advocates and environmentalists are even likening Obama to George W. Bush.
Labor and gays are restless. Blacks and Hispanics are grumbling. Liberals and moderates are battling.
Obama must bring together -- and fire up -- the many Democratic coalitions if he hopes to minimize expected election losses for his party this fall.