Click here to watch "Delighted."

With his ratings at historic lows, President Bush has remained sidelined during this election season, but his No. 2, Dick Cheney, did emerge this weekend to throw his support behind John McCain. Democrats seemed more excited by this particular endorsement than Republicans, however, as it feeds into their storyline about McCain's ties to the current administration.

Barack Obama's campaign was quick with its reply, releasing a new TV spot just hours after Cheney's remarks from his home state of Wyoming.

"Delighted" (subscription) juxtaposes some of Obama's most respected backers -- billionaire businessman Warren Buffett and former Bush Secretary of State Colin Powell -- with McCain's latest supporter. Showing footage of Cheney endorsing McCain and running mate Sarah Palin, an announcer quips: "Boy, did McCain earn it. He voted with Bush and Cheney 90 percent of the time." "And that's not the change we need," he concludes.

The ad comes as both candidates ramp up their efforts in the final 24-hour push before Election Day. Obama today will hit three states that went for Bush in 2004 -- Florida, North Carolina and Virginia -- while McCain makes stops in seven different battlegrounds.