During a debate Wednesday night, Ron Barber, the Arizona Democrat running to replace Gabrielle Giffords in Congress, would not confirm that he plans to vote for President Obama's reelection. The same night, Heidi Heidtkamp told the Associated Press that Obama has "failed in the one test America had for him, which was to unite the country." Heidtkamp, a Democrat running for Senate in North Dakota, and Barber are just the latest two members of Obama's party to distance themselves from the president. West Virginia's Gov. Earl Ray Tomblin and Sen. Joe Manchin, both Dems, have said they're not sure who they'll vote for in November. And just this week, Obama surrogate Cory Booker slammed the president's campaign for attacking Mitt Romney's business record and received the support of fellow Democrats.