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The American people cannot impeach. That power belongs to the legislative branch. As impeachment is, essentially, a legal procedure, it makes sense that it isn't done through popular vote, since at the time of the founding of the country there was no media capable of bringing people "into the courtroom," and even today it would be impossible for the country to stop all activities to pay attention to what was going on.
The worst Americans can be accused of in terms of impeachment is failing to elect congresspeople who would impeach Bush. In defense of the American people, the Democrats stated and implied they would take a serious look at the Bush Whitehouse and file appropriate charges. Instead the Democrats have allowed the Whitehouse to stonewall and, in some cases, openly lie to them. The Democrats' spinelessness was not entirely predictable.