Clinton, D-N.Y., appearing at her first solo campaign rally for Obama in Las Vegas on Friday, told cheering supporters to disregard any lingering resentment from the bruising Democratic primary election battles and instead back the party's probable nominee, the New York Daily News reported.

"Anyone who voted for me or caucused for me has so much more in common with Senator Obama than Senator McCain," Clinton said, referring to Obama's probable Republican opponent, Sen. John McCain, R-Ariz.

McCain, meanwhile, campaigned in Clinton's former home state of Arkansas, where the newspaper said he is leading Obama in some state polls. Looking to court independent voters, McCain said, "I'm certainly pleased with where we are" in the state.

McCain said his campaign was gaining support among "Reagan Democrats" and others -- "some we might call 'Clinton Democrats' as well," the Daily News reported.