As per usual, Jay Smooth gets at the heart of the matter:
This recurring theme of turning the phrase “community organizer into some sort of epithet like “communist” or “homo” or something, that’s really despicable. The difference between a community organizer and a politician is that community organizers are the ones who take the responsibility upon themselves to help their fellow citizens without the benefit of a government budget behind them. And go out there every day doing the hard thankless work to make this country livable which is what allows you politicians to be able to go on TV and brag about how this is the greatest country in the world. And for you to go on that TV show and spit in those people’s faces for the sake of a rhetorical flourish is disgusting.
[...] Here’s the best response I’ve seen to this new line of attack. (The bit about community organizing starts about halfway through.) [...]