Tonight is the first debate of the 2012 presidential campaign between President Obama and Mitt Romney at the University of Denver.

FOX News Radio's Jessica Rosenthal and Jared Halpern report from Denver:

From America's Election Headquarters...

I'm Jessica Rosenthal at the University of Denver, where President Obama meets Mitt Romney for the first debate. Campaign Senior Adviser Robert Gibbs says the President has spent the past couple days in Las Vegas getting ready for tonight but...

(Gibbs) "Things have been popping pretty quickly in the Middle East for the last several weeks. He hasn't gotten to do as much prep as he'd like to, but I have no doubt he'll be prepared."

Adding that it wasn't all work, he took a brief trip to visit the Hoover Dam.

The Republican campaign is already trying out an attack line after Vice President Biden said the middle class has been buried the last four years.

(Ryan) "Of course the middle class has been buried. They're being buried by regulations, they're being buried by taxes. They're being buried by borrowing."

Running mate Paul Ryan in Iowa.

Not far from here, in Littleton Colorado, Mitt Romney getting support from his wife Ann, who told supporters she can't wait to hear the contrast.

In Denver, Jared Halpern, FOX News Radio.

WATCH to learn more on the first presidential debate in Denver:

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FOX News Radio's Jessica Rosenthal reports from the University of Denver inside the debate hall, WATCH: