[b]Ross Perot:[/b] Not a grass-roots movement. Ross Perot announced his candidacy and formed the Reform Party, getting himself onto the ballots in all 50 states. In hindsight, I don't believe he had any intentions of winning. His motives (in my opinion) were twofold: to create a platform to voice his ideas and concerns about runaway spending and debt; and to take votes from his arch-enemy, GHW Bush. He succeeded on both counts, although the former has fallen upon deaf ears. But voters like you and me bought into it, and by doing so, we also delivered the latter, sealing the election for Bill Clinton.
[b]Newt Gingrich's Contract with America'[/b]: You called it yourself; it was the brain-child of Newt, not any grass-roots movement. They sold their ideas, but they failed on the implementation.
[b]Hippies[/b]: I wouldn't call that a political movement, but rather a factor in massive social change. And whether or not they were [i]treated with much respect[/i], as you suggested, depends on one's perspective and time-frame. Politically speaking, it could be argued that their anti-war protests resulted in an end to the Vietnam War without a declared victory. And then they cursed and spat upon the returning soldiers. I suppose the soldiers of the time didn't view them with much respect. I find it ironic, however, that the anti-government hippies of the 1960s and 1970s are, for the most part, the big-government progressives of today. The hippie movement kind of segued into the Environmental movement.
The [i]Tea Party[/i] movement will never be a political party, like the Reform Party was (at least I hope not). Conservatives and/or libertarians generally aren't known as vocal activists. This is the first time it's happened in my lifetime.
And if America continues on its current road to more socialism, you might see more conservative and libertarian activists demanding a return to the principles of liberty that were intended for this country. And if America does continue on its current road to more socialism, prepare yourself for a second American Revolution - armed or otherwise.
I can't recall any time in history when people revolted in favor of less freedom and liberty. They always revolt for more. And the more that's taken away, the closer we come to revolution.