He's very popular in his home state of Indiana. The Bayh name is a dynasty there. He's the son of Birch Bayh who was also a Senator for Indiana. Evan was a two term governor who did not raise taxes (maybe the only one in the nation for those eight years). His ACU rating as a Senator is around 20 which isn't moderate, except for a Dem. He appears moderate and has a good looking family and is generally regarded as Mr. Clean. No Clinton like baggage here.
He's probably the best guy they can nominate. He was snubbed for the veep pick in 2000 because he votes against partial birth abortion.
Sounds like a formidable foe, eh?