You and I don't disagree. I think it's probably silly to have an embassy if it requires large numbers of American troops and a green zone, which to me is a military base. I'm just looking for ways candidates are carving out wiggle room.
These are important questions, but I don't think there's a one size fits all criteria. Right now, Udall screwed us and he needs to know there's a consequence here for doing it. We have no leverage on Tester and Webb at the moment, and frankly, we didn't run them because they were progressive but because we thought they could win. As such, it's pretty hard to claim they are selling us out. Bernie Sanders and Sherrod Brown they are not.
2008 is much more of an ideological playing field. Now we have some power and Bush has opposition. It's time to move to stage two, which is to put progressives in power.