So? The deregulation occurred on a bipartisan basis in the 1990's with a Democratic President at the helm. Most of it passed 90-10 or so. The biggest change to regulation under Bush was Sarbanes-Oxley in 2002/2003ish to respond to Enron and Worldcom. Bush also wanted higher standards on Fanny and Freddie in 2003, 2005 and again in 2008. He was blocked by a bipartisan group of Senators led by Chris Dodd and I believe John Kerry until it was too late, 2008. Obama may even have helped block it in 2005, but I would need to look at that. In what world is the DNC talking points about Bush being an ideologically driven deregulator, accurate? He was very pragmatic on it.
And just to call you on your facts, the Democrats had the Senate from 2001-2003 because of Jim Jeffords. The Republicans only had complete control for four years from 2003-2007.
And there's the point, you can't unilaterally blame Democrats for problems. Republicans have had a seat at the table for most of the past couple of decades, they have to take some responsibility. It's not one sided.