The gauntlet has been thrown down. Colbert begs Lieberman to appear on his show as he worries about the Lamont-post-Colbert bump in the polls. He even had a whole bunch of goodies to sweeten the spot.

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Ned Lamont showed up for it, so why won't Lieberman?

Atrios calls it a smackdown

Spazeboy: Stephen extends an invitation to his favorite Republican.

Matt :Stephen Colbert has issued a plea — in fact, a “golden opportunity” — to Senator Joe Lieberman (Me! Me! Me!-Connecticut)