There hasn't been a US president that hasn't been guilty of impeachable offenses, if Ramsey Clark's allegations are the yardstick to be used. However, it is just as important to remember that this is an exercise in futility. US law is very clear about how brings the articles of impeachment, and who oversees the trial.

Is there anyone who seriously believes the US House of Representatives, controlled by militant Republicans to the right of Bush/Cheney, et al would actually bring this to the US Senate, which is now also controlled by militant right wing Republicans?

Why should the anti-war movement waste it's time on this sort of thing? I much prefer putting time, energy and resources into strategies and tactics that work, not this sort of grandstanding.