Diana Krall, Elvis Costello Make Merry With Stephen Colbert

Guests open 'Christmas Carol Week' on 'The Colbert Report'

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When he's not busy handicapping his own chances of replacing Jim DeMint as one of South Carolina's U.S. Senators, Stephen Colbert is celebrating the season with a slate of guests singing Christmas songs with him this week on The Colbert Report. Last night, he took a credible turn on "Have Yourself a Merry Little Christmas" with Diana Krall and her husband, Elvis Costello, trading verses on the somber tune as guitarist Marc Ribot added to glistening piano lines from Krall.