That state doesn't count because it's too black. That state doesn't count because there's too many latte liberals. That state doesn't count because it's a red state (Oh and then she went and staked her entire campaign on Texas and Ohio.) It basically boiled down to "The only states that count are the ones that vote for me" and it became a joke. People began to talk about how they were proud residents of a state that didn't count. Remember Joe's old sig?
True, and that was basically Obama's coalition: caucus states + large black populations + latte liberals. If you want to break it down that way. Of course, it's possible to
lose a Dem primary campaign with that coalition. There are a bunch of other intangibles to consider. But in terms of mentality from team Clinton it set the bar too low for them to not compete in any of his coalition and that was a mistake.
She was probably hoping for a solid 5-10 point (instead of 0.5) or more lead in the popular vote and a 100+ delegate vote lead. However, the last week before Super Tuesday was utterly brutal for Clinton and no one could have anticipated-- Obama delivered his best speech in a campaign of good speeches after South Carolina and basically every news outlet was overwhelmingly positive for Obama; they completely shut out the results in Florida and they made him peak at just the right moment.
But you can't play Rudy Giuliani in politics and just ignore everywhere that doesn't favor you.
That's depends on the circumstances. She took a huge gamble on Iowa even though the conventional wisdom was that the politics didn't favor her, and it was a massively blown investment.