IIRC the so-called "blue dog" Democrats in the House were the main obstacle preventing Obamacare from being more progressive. Unfortunately, they were right to

IIRC the so-called "blue dog" Democrats in the House were the main obstacle preventing Obamacare from being more progressive. Unfortunately, they were right to be afraid...many of those Democrats lost their seats in the following years. In retrospect the Democrats' window of complete control of the federal government was going to close no matter what they did (due to the GOP's obstructionism and unity in hating anything Dems did), and perhaps they should have passed more ambitious reforms while they had the chance.