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Like some of his rivals, Mr. Huntsman is hoping the late-night comedy circuit will help boost his popularity.

CBS announced Wednesday that Mr. Huntsman will join Mr. Letterman on Dec. 21.

GOP candidates Rick Perry and Michele Bachmann also have done the late-night comedy tour. So did Herman Cain, before he suspended his campaign. Mr. Huntsman also took part in a recent “Saturday Night Live” skit.

From wire dispatches and staff reports