Not long ago I said you would do just this. The Democrats depend on Progressives as being Whores of Babylon in order to keep everyone else out. Don't feel bad because you are in good company. The fundamentalist Right is your counterpart and though they won't get to ban abortions nor change how evolution is taught they'll vote Republican.
You are both being used and wouldn't have it any other way.
Wrong.
Progressives are a minority of voters in the country. That's the problem. It makes sense to elect a candidate better than the far right. We don't need to repeat picking Nixon over Humphrey, Reagan over Carter, almost picking Bush over Gore. That simple strengthens the right to hold power, despite the backlashes against their bad governing.
The left makes sense to pick the better candidate over the far right. And we need to move more in the country to support a progressive.
And to fix the corruption of money in elections.
The fact Wall Street is one of the most destructive parts of our society, and that the people 'choose' the candidate Wall Street funds the most, is not a good thing.
A lot of what this 'right left', 'tea party against others' stuff does is to split the people's vote, canceling it out, instead of it unifying against Wall Street. The second you say 'here's a candidate who is for the people and against Wall Street', he's immediately assigned 'left-wing' or 'right-wing' and has half the country against him.
The lack of a point in your post is shown by the lack of what you are saying progressives should do. Vote for the corporatist Dem, vote for a Republican, nominate their own candidate, don't vote. Those seems the choices. At some point, progressives might need to refuse to vote for the corporatist Dem, to push the Dem to the left. But right now that would mean electing a disaster we can't afford to elect. If the Republicans would nominate a half-way decent candidate, it would be easier to do.
We've seen how this goes, such as with Bush getting the presidency in 2000 - repeating that with 'worse than Bush' Perry won't help.
Progressives are recruiting a primary nominee against Obama in 2012, and I plan to support the candidate, but not enough voters do.