I tend to agree with the logic that says Obama is the better candidate because he is doing better in the states that typically vote Republican.
The Democrats in the "democratic" states (e.g., CA, NY), likely would vote for Obama if he has the nomination, but neither the Democrats nor the Republicans in the non-democrat states would vote for Hillary.
I could see a lot of people that like Obama and dislike both Clinton and McCain just not voting or voting for a 3rd party candidate - which would give McCain a victory.
Therefore, Obama is the better choice.
And I hope he doesn't pick Hilary as his VP. She was obnoxious as first lady when she tried to ram her healthcare plans down our throats. Just imagine if she were VP.