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I provided numerous examples in what I just wrote of how flagrantly untrue this claim is. I documented the extreme, virtually complete, agreement among the parties over the last eight years on most of the most consequential matters.
What you described is not bi-partisanship, as I understand that idea. Yes, the Congressional Democrats have been spineless, roundheeled appeasers of the Bush Administration. But, except in the immediate aftermath of 9/11, that was NOT because that because they truly wanted to work together and seek common ground with Republicans. It was because the Democrats calculated -- correctly, as it turns out -- that refusing to confront Bush was the best way to achieve political market dominance. In fact, the nastiness and bickering and backstabbing proceeded apace through the Bush years. The Democrats were simply cowed because they were absolutely terrified of getting blamed for another terrorist attack (or the loss of the Iraq War; ironic, since it was lost before it began).
The truth is: Having people fight with each other is good entertainment. And where there is good entertainment, there is a lot of money to be made. Political partisanship is a big business. That doesn't make it a good thing for democracy.
(I hope these comments meet your exacting standards.)