Interesting.
Is Obama a competent politician? Depends on your views. If elected, will it be because of his competency and the voters' agreement with his policies? Absolutely not.
I really don't know enough about each candidate's policies to make an informed vote (I can't vote yet anyway) or judgment either way, however, it definitely seems to me, at least in having interacted with Obama supporters and from watching TV, that he's gotten so much support because he is the "cool candidate", because hey, "It'd be cool to have a black president!". None of the people I've talked to who plan to vote for him have any reasoning to explain it. This is about the best they can come up with;
"I'm voting for Obama!"
"Well, why?"
"Because McCain sucks, he's old."
...and this is the 18-22 year old voting base that is pretty much entirely for Obama, and has no idea why other than it being the cool thing to do.
He could be the greatest politician ever, and have the world's greatest fiscal policies, and he still would only get elected because he's hip.
Interesting video:
YouTube - Howard Stern Exposes Clueless Obama Supporters