The dems got what they wanted. Lots of face time to appease their insane base, plus the MSM barrage pushing more Americans to believe that guns really are THE problem. They likely moved the percentage their way, the crisis is over, so rather than losing the senate and their power, they stopped.
They understand when to stop. They push the envelope, then pull back to the safety of their power, knowing they've moved public opinion incrementally, and now they lie in wait to move public opinion again with the next shooting.
Too bad our purists don't understand how to gain and keep power like their purists.
Funny dynamic, isn't it?
The more purist a politician on the left is, the greater the support among their public and colleagues is.
The more purist a politician on the right is, the greater the support among their public is, but not among their colleagues and the professional political class.
Pat Caddell explained it in excruciating detail at CPAC 2013.