"'Bush's tax cuts to the rich' (I got a tax cut. I had no idea that 50k/yr made you rich!)"
I think you're being disingenuous. The point being made is that although the Bush tax cuts affected every bracket, the brackets they favored most were the highest ones.
"Then the economy tanked. What changed? Here's another hint, it rhymes with congress."
I'm sorry, but if you think that the Democrats in Congress did anything to affect the economy this badly in the space of only one year in office, I don't think you paid the slightest bit of attention to the legislation passed in 2007. You could cite legislation they passed in 2008 for making it WORSE, or reform they blocked while in the minority before 2007, but there's nothing to even correlate with the downfall of the economy for that year except for raising the minimum wage.
Secondly, in the year 2001, Republicans had a majority until June 6 when Jim Jeffords switched in June, and a 10 to 12 member majority in the House of Representatives. Using your own logic, then, the same party as the President must have been responsible.
In truth, what you describe is the official description of the president's role, but if you took a political science class, you would know the president has considerable influence over Congress. The President has used Rahm Emanuel and Joe Biden effectively to mediate disputes between members of Congress and make sure that the interests of members in favor of a bill are aligned, such that less disputes arise between one faction fighting for something in a bill another faction wants out.