That's the thing... I'm not sure if it's a case of naivete, ignorance, or just downright arrogance but I don't think Obama truly understood the divisive nature of the Democrat party.
While the Republican camp has a broad spectrum of adherents, ranging from the more secular "libertarian" wing of the party to the theonomic "religious right" contingent, there is generally more of an approach of forsaking the petty skirmishes to win the broader war for Republicans than the Democrats.
In recent years (and especially those spent in DC) I have observed the pervasive mindset of entitlement amongst the Democrats... such that each frond of the fringe thinks themselves the most vital aspect of the Democrat party.
The Black Caucus says: "The candidate better make us happy or we won't turn out!" The Planned Parenthood/Abortionist lobby says: "The candidate better make us happy or we won't turn out!" The Feminazi NOWers say: "The candidate better make us happy or we won't turn out!" The GLBTers say: "The candidate better make us happy or we won't turn out!"
So, candidate Obama promises each group the moon and is everything to everyone... he speaks the typical liberal agitprop, appeals to the moderates with a "reform" meta-narrative (see: "change") and even throws the evangelicals a bone by buddying-up with the current religious rock star (see: Nixon/Reagan and Billy Graham).
As a result of all this (and enough weary Republicans sitting this one out) the Democrat candidate wins... and now it's time to pay the check.
This recent flap is but a harbinger of what's to come.