With Election Day exactly four weeks from today, presidential nominees John McCain and Barack Obama debate for the second time tonight.
How to watch: 90-minute debate begins at 9 p.m. and will be broadcast on all major networks.
The format: NBC's Tom Brokaw will moderate a town hall-style meeting at Belmont University in Nashville, Tenn. Undecided voters, selected in advance, will ask most questions. Brokaw may ask questions submitted online via MyDebates.org.
The topics: Questions can center on the economy and foreign policy. Economic questions likely to dominate.
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