MCLEAN, Va. (AP) - Democrat Tim Kaine and Republican George Allen are set to square off in another debate in one of the nation's marquee U.S. Senate races.

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The two former governors will participate Thursday in the first of three debates to be held over the final seven weeks of the campaign.

Their race is one of about a dozen that could decide who's in charge on Capitol Hill in January.

Thursday's debate is hosted by the Fairfax Chamber of Commerce. It's been a staple for every modern statewide candidate for years and often generated news that affected the course of campaigns.

The debate will be moderated by David Gregory of NBC's "Meet the Press."

The candidates will face off again Oct. 8 in Richmond and Oct. 18 on the Virginia Tech campus.