With Barack Obama set to announce his vice presidential pick within weeks (and maybe just a couple weeks), it's worth considering the faces we've seen representing the Senator in public. After all, a VP candidate should be tried and tested in the media spotlight, right? In particular, you'd expect potential candidates who hadn't spent much time in the national spotlight to have a "test run" on at least one Sunday show, and at least a few weekday cable news show appearances.

Evan Bayh, Tim Kaine, Joe Biden, and Claire McCaskill have all taken leading roles as surrogates. Bayh is particular has cropped up all over the place just as his name has risen in the "Veepstakes."

Who haven't we seen? Kathleen Sebelius. Despite being a prominent name on almost every list, I can't think of a lengthy appearance Sebelius has done for Obama.

Sam Nunn. Nunn was always a questionable choice IMO, but he's also been absent for the most part on the cable shows.

Add to this list of no-shows (for the most part) VP longshots Sherrod Brown, Brian Schwietzer, and Janet Napolitano.

Of course, Clinton or Edwards arguably wouldn't need this kind of media vetting.