Thompson to Make Debut at GOP Debate Republican presidential candidates are preparing for today's debate, which — with the participation of former Sen. Fred Thompson — will bring all nine candidates together in one forum. The event begins at 4 p.m. ET in Dearborn, Mich.

Thompson to Make Debut at GOP Debate

Thompson to Make Debut at GOP Debate

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For the first time, actor and former Tennessee Sen. Fred Thompson will join his competitors for the U.S. presidency in a national debate. Mike Murphy, a Republican political consultant who has run campaigns for John McCain and Mitt Romney, discusses the upcoming event with Deborah Amos.