TV ad blitz starts in Nevada

With only four days before the next big Democratic presidential contest, the Nevada caucuses, the TV ad battle is starting to ramp up.

Barack Obama started two Spanish-language spots in a state where Hispanic voters are numerous. A 60-second one emphasizes Obama's heritage -- his father was born in Kenya, his mother was born in Kansas -- and shows him calling it a life story that could only happen in America. It also highlights his call for hope with excerpts of speeches with Spanish subtitles.

A 30-second spot draws attention to Obama's proposals on healthcare, education, and jobs.

Meanwhile, the American Federation of State, County, and Municipal Employees is running an ad on behalf of Hillary Clinton featuring testimonials from women. Female voters provided Clinton's margin of victory over Obama in her comeback win last week in the New Hampshire primary.

The most recent polls show a tight race in Nevada among Clinton, Obama, and John Edwards. They will debate at 9 tonight on MSNBC from Las Vegas. The ads were first reported by The Page, Time magazine's political website.