Serious Question: Are caucus delegates required to vote for

[Skwmom]

the person they were chosen to represent? For example, let's say Obama wins 5 delegates in a precinct. Then the people in the precinct who voted for Obama vote/nominate the actual delegates to attend the convention. Does the nominated delegates have to vote for Obama at the convention (or can they vote for Clinton)?

For example, if the Clinton campaign knew Obama was going to win a caucus, could they get their supporter(s) to attend a caucus as an "Obama" supporter or an uncommitted who switches to Obama, get them nominated as an Obama delegate, and then have that delegate vote for Clinton at the convention? I remember how NV said something about their delegates not being committed (or something along those lines). I'm asking this b/c of a caucus blog I read which really made me question how committed that Obama delegate actually was (and because of the anything to win mentality I've seen displayed by the Clinton camp).