Marc Ambinder has given his short list of VP candidates for McCain and Obama (what, no Clinton? Let's just say that ship has sailed...).
On the Obama list is Chuck Hagel, Republican Senator from Nebraska.
Now, Chuck Hagel's a decent enough senator, for a Republican. But Chuck Hagel is a Republican! Keep in mind that one of the key things a Vice President does is wait around to run for President in eight years. That's why people accept the offer-being the de facto incumbent carries significant advantages in name recognition and credit-taking for a successful administration.
Cheney being too infirm to run (you do realize that's the only reason, right?), and Gore having run away from Clinton's accomplishments (and scandals) were seriously anomalous. And Quayle was...well...Quayle-and all he had to run on was his name, which had become a joke and the legacy of Bush I, which the voters rejected after one term. He was even too young to have any Reagan residue left over on his suit. So of course he went nowhere in 1996 or 2000.
But don't let all that recent VP electoral failure blind you to the reality that there is a significant advantage for a Vice President entering a presidential race. Bush I, Ford, Nixon, LBJ, Truman-all were VP's, and they make up 45% of the Presidents since 1950. There isn't any position that has a better pre-presidential track-record.
I don't want Obama to give anyone who will appoint Scalias, Robertses, Alitos, or Thomases a leg-up in the race to be his successor. Besides, this race will be freighted with enough history without some sort of unity ticket.
If Senator Obama wants to make more history, he can do so by choosing an accomplished woman for VP, but he should leave the Republican VP nominations to McCain.