EXCLUSIVE: Barack vs. Bill: Obama Hits Ex-Prez Over 'Troubling' Attacks

Hillary Clinton's campaign manager Howard Wolfson said Obama may just be smarting from his loss to the New York senator in the Nevada caucuses on Saturday.

"We understand Sen. Obama is frustrated by his loss in Nevada, but facts are facts," Wolfson said. "Sen. Obama's allies in Nevada engaged in strong-arm tactics and intimidation against our supporters and his record against the war has been inconsistent. President Clinton is a huge asset to our campaign and will continue talking to the American people to press the case for Sen. Clinton.

"Of course Sen. Clinton and Sen. Obama are the candidates on the ballot and she is winning because she is giving voice to the Americans who will provide real solutions to the challenges they face in the daily lives," he said.

During the run up to the caucus, Obama received a lot of pressure to denounce a third-party advertising supporting him, but accusing Sen. Clinton of abandoning Hispanic workers.

"The ad that happened in Nevada, we had nothing to do with. I wasn't even in the state of Nevada when it went up for the couple of days right before the caucus," Obama said.

"To the extent that it implied that Sen. Clinton was trying to suppress Hispanic votes, I think that would be absolutely incorrect and unfair. I think that they were concerned about the fact that the Clinton ad -- that Clinton supporters, not the Clinton campaign -- the Clinton supporters had filed a lawsuit in the eleventh hour to try to change the rules of the caucus in the way that they thought would advantage them. And this happened right after the union endorsed me. So understandably, the union was upset," he added.

He did not denounce the ad, but when a similar ad in Iowa aired against him, Obama said third-party ads should not be tolerated.

"What I don't want is a situation in which we are so driven to just win that we are willing to say anything, and over time, you know the American people just get turned off because they don't believe what politicians say," he said.

"My concern is not to try to go tit for tat on these issues and it's also, you know, not to suggest that there's not going to be some sharp elbows in politics. I understand that there are going to be sharp elbows in a primary and certainly there's going to be some rough 'n tumble in a general election," Obama added.