At the core of the problem for the President is his own Party! Reid and Pelosi think that they aren't obligated to work with the President as did Congress under Bush - whatever Chaney wanted, Bush got going, and Congress backed it.
Look, Pelosi set the tempo for ratifying the Health Care initiative with the 'reconciliation package'; Reid took the reconciliation package and dumped it on the 'floor' as garbage. Had Reid done as he was advised to do, the Health Care Bill would not have been watered down. He said he would use the reconciliation tactic, but he didn't! By seeking a compromise with the Republicans, the Bill lost its effectiveness and became a shell of what it could have been - thanks to Reid's incompetence and lack of a backbone!
The Blue Dogs forced his hand at every turn. When you are trying to get legislation passed that involves issues that need to be addressed quickly and with authority, his own Party cut him down with ne'er a thought as to how they were weakening him. Nearly sixty percent of the 'Blue Dogs' were not re-elected - that was the Democratic base getting rid of a thorn in his side.
The next issue of great importance to the re-election of a Democratic majority was that no one, I say no one, wanted to tout the accomplishments of the first two years with control of both Houses. That decision cost the Democrats dearly - they failed to communicate with the people that they were trying to help! Independents and crossovers from the Republican Party believed the lies from Boehner and McConnell, and turned 'red'.
There are more, but these two issues were key then, and still are for the Democrats to be a force to reckon with over the next two years.
In a democracy, silence is not golden; it is condonance in the face of injustices; it is fear, where the thought of reprisal fosters control – Rodney A. Davis