Back in 1992, Newt Gingrich crafted a clever campaign for the House of Representatives - the Contract with America. This was a 10-point pledge of what the Republicans would do within the first 100 days if they gained control of the House. For the first time, Congressional elections became NATIONAL, rather than local. The Republicans swept the House for the first time in 40 years (in no small part because of the total failure of HILLARYCARE). The Republicans also won eight Senate seats, giving them the majority there. (Two Democrat Senators switched parties after that election.)
With the leadership change in both the House and the Senate, many long-time Democrats were not interested in being in the minority party, and many hung it up... and many that left were the more moderate Democrats. It was the left-wing-nuts like Pelosi and Waxman, Dingle, Durbin, and Reid who stayed in office.
Then in 2006 when the Democrats took back the House, and in 2008 when the Dems regained the majority in the Senate, it was these same nutcases who had the seniority and became Speaker, majority leaders and chairs of committees. THAT is how we got such an idiotic law as the ACA... because of these socialist wingnuts in charge.
Yep - all Newt's fault!