See this post by John Hinderaker of Powerline, for details. I particularly like these two quotes, the first he cites from Dana Milbank of The Washington Post:
Although there's general agreement that the most pressing issue facing the federal government is its runaway finances, the Democrat-controlled Senate hasn't passed a budget in 762 days, a new standard for dereliction of duty.The second Hinderaker quotes from an editorial of the left-leaning New York Times:
If Democrats are ever going to regain the momentum in the national conversation, they have to stand for something.
That's the problem with "big tent" politics; sometimes you cannot please everybody you'll need to reach a majority.