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The only question mark is Bob Barr, the Libertarian Party candidate. Mr. Barr has made it clear that he will only debate Mr. Nader and no one else.

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Christina M. Tobin, an event organizer and a Nader campaign staffer , said that she “challenges” Mr. Barr to show up.

“Let him show that he is a true Libertarian,” said Ms. Tobin, who grew up in a prominent Libertarian family. “This is a golden opportunity to get exposure and for people to hear his views. For him not to show up would be denying his Libertarian principles.”