Background to the Democrats' civil war

President Obama's press conference this week contained his testiest response yet toward “sanctimonious” ideological purists on the Left — the group of purists represented by the House Democrats who backed a non-binding party caucus vote against his tax plan in the House today.

I would not be the first to suggest that it could represent something of a triangulatory, Sister Souljah moment — a turning point for his presidency.

Obama's press shop famously brought down the liberals' house with its derogatory comments on the “professional left,” but the president's own previous dealings with the professional left have been a bit more cordial.

Here is Obama, showing a gentle side toward heckling gay activists at a fundraiser for Sen. Barbara Boxer, D-Calif.:

Here he is being heckled by AIDS activists in Connecticut, and showing a bit of anger (and giving an inaccurate response):

Robbed shopkeeper says San Francisco is so broken it needs Batman

The Deli Board’s Adam Mesnick is sick and tired of SOMA crime

Redwood forest in California is returned to native tribes

523 acres will be transferred to 10 tribes whose ancestors were forcibly removed from the land

Opinion: California’s electric grid is not ready to meet climate goals

We must start now to develop the electric grid of the future that will make clean energy possible