Saul Alinsky's Rules For Radicals:
13. Pick the target, freeze it, personalize it, and polarize it. In conflict tactics there are certain rules that [should be regarded] as universalities. One is that the opposition must be singled out as the target and 'frozen.'...
"...any target can always say, 'Why do you center on me when there are others to blame as well?' When your 'freeze the target,' you disregard these [rational but distracting] arguments.... Then, as you zero in and freeze your target and carry out your attack, all the 'others' come out of the woodwork very soon. They become visible by their support of the target...'
That's one reason why the Dems fear and hate the Tea Party. It is largely a leaderless revolution driven by a cause rather than a leader and his personality. A leader provides a target for the Dems and MSM to lie about. No leader = no primary target that can be frozen and attacked.