So you are saying that in 2008 Alabama would vote for a Dem ticket with Hillary on it instead of a GOP ticket with Condi Rice as the VP candidate because Condi is black?
Utter nonsense.
You seem to be rather confident that Hillary is going to be nominee, that no one is going to fight her for it.
That makes the assumption that despite their disarray, all Democrats everywhere will coalesce around her early, and all the other ambitious Democratic politicians (including Landrieu and Lincoln) will put aside their personal ambitions for the "good of the party"
That doesn't hold up to the political smell-test. Hillary will have opposition, and she (like Allen and McCain) is at a disadvantage because everyone knows she's running, she's not exactly sure who'd oppose her, and so her enemies can run a much more effective digging up dirt campaign against her then she can against them
What did in Gary Hart?... the fact is, Gary Hart was presumed to be a likely nominee from 1985 onward, and that gave everyone who wanted to be President the time to dig up the goods on him, and he certainly didn't help anything by taunting the press. The press had to a large degree, hyped him as the guy, he started to believe his own hype and that's why he made the mistake he did.
If I bet on things such as this, I would be willing to bet good money Hillary doesn't win the nomination.