I think Biden represents, for many people, a responsible and serious politician. Everybody else on the Democrat side is a circus sideshow freak, as far as I can tell. In that field, Biden stands out. Dodd, being from CT, might be too familiar for your father to support...
I guess that makes sense (my parents are actually from New York, but still - same idea). I don't even know if I am going to vote in the Democratic primary in Connecticut next year. I have no idea who I would vote for. There really are not any Democrats I like, so should I choose an easily-defeatable one (Dodd, Kucinich?), or the least-offensive one (whoever that is - Richardson? Biden?).