McCain, Obama tentatively support bailout plan

* Candidates still want to see details

* Obama wins early debate polls

* Vice presidential candidates debate Thursday

By Caren Bohan and Jeff Mason

WASHINGTON (Reuters) - Republican John McCain and Democrat Barack Obama on Sunday tentatively supported the $700 billion plan to bail out the U.S. financial system.

"This is something that all of us will swallow hard and go forward with," McCain said on ABC's "This Week." "The option of doing nothing is simply not an acceptable option."

"My inclination is to support it," said Obama, his Democratic rival in the Nov. 4 U.S. presidential election.

"While I look forward to reviewing the language of the legislation, it appears that the tentative deal embraces these principles" the Illinois senator said on CBS' "Face the Nation," referring to requirements he said needed to be in the package.

Congressional negotiators announced early on Sunday they had reached tentative agreement on a compromise deal that altered key parts of a Wall Street bailout program initially proposed by the Bush administration.

Both candidates refused to be pinned down on the economic plan during their first presidential debate on Friday. By Sunday, with a tentative deal in place, each gave general support with comments that the taxpayers had to be protected.

Later at a rally in Detroit, Obama called the bailout an "outrage." "But we have no choice," he said in prepared remarks. "We must act now. Because now that we're in this situation, your jobs, your life savings and the stability of our entire economy are at risk."

Supporters tried to play up their candidate's roles.

Republican Sen. Lindsey Graham of South Carolina told "Fox News Sunday" said Arizona Sen. McCain played a "decisive" role in getting balky House Republicans to focus on negotiating a compromise. McCain cut his campaign short last week to return to Washington to deal with the crisis at a White House meeting.

But Democratic Sen. John Kerry of Massachusetts told the same program it was Obama who took the lead at that meeting while McCain remained silent.

McCain resumed his campaign the next day so that he could attend the debate in Mississippi. Early same-night snap polls generally showed Obama winning the first of three encounters between the two nominees.

McCain tried to paint Obama as naive and too inexperienced to be president, a tactic Obama shrugged off as a "debating trick."