TRUMPETING CHENEY’S ENDORSEMENT…. Yesterday afternoon, Dick Cheney offered his full support to the McCain/Palin ticket. Soon after, the development was heralded by Barack Obama, while campaigning in Colorado.

And soon after that, with impressive speed and efficiency, Obama aides took advantage of Cheney’s endorsement by putting together an ad about it.

“Barack Obama. Endorsed by Warren Buffett and Colin Powell,” the voice-over tells the viewer. “And John McCain’s latest endorsement?” And there’s Dick Cheney.

I also like the way the lines are drawn. The ad notes that Obama has earned the backing of Warren Buffett and Colin Powell, while McCain has earned Cheney’s support. The spot seems to imply a question: which of these two sides do you prefer?

Also note the wording of the 90% line. For months, the talking point has been that McCain has voted with Bush 90% of the time. In this new ad, McCain has voted with Bush/Cheney 90% of the time.

With the countdown to Election Day now being gauged by hours instead of days, the campaigns have reverted back to bottom-line arguments. For McCain, that means describing Obama as inexperienced. For Obama, that means describing McCain as four more years like the last eight. Cheney’s endorsement, the weekend before the election, was therefore an unexpected gift at the Obama campaign’s doorstep.

The ad is set to run nationally on cable.

Steve Benen

Follow Steve on Twitter @stevebenen. Steve Benen is a producer at MSNBC's The Rachel Maddow Show. He was the principal contributor to the Washington Monthly's Political Animal blog from August 2008 until January 2012.