Fox News:

Vice President Joe Biden and Democratic National Committee Chairman Tim Kaine are set to hit the comedy airwaves Wednesday night, with Kaine appearing on “The Daily Show,” and Biden following him on “The Colbert Report.” Will hilarity ensue? And will the appearances really add to the political message Democrats hope to communicate to voters this campaign season? For politicians, appearances on comedy shows can be crucial.
For one thing, it’s a chance to reach a younger audience. A study by Rasmussen Reports released last year found that nearly a third of Americans under the age of 40 get the bulk of their news from satirical programs like “The Daily Show” and “The Colbert Report.”
For another, politicians who grace the couches of late-night talk shows have a chance to reach a large audiences. Shows like “The Tonight Show with Jay Leno” and “Late Show with David Letterman” regularly pull in over three million viewers a night.
And, yes, hilarity usually ensues.

I can see Biden being funny, but I highly doubt Tim Kaine will produce many laughs.