Barney Frank shows his fellow Democrats how it's done:

Hello, Democratic members of Congress? Be like Barney, please. Nowhere is it written that Democratic elected officials have to be ceaselessly polite to lunatics—whether they're showing up at town hall meetings, sitting in Congress themselves, or ranting away on cable news. Your sane constituents will applaud you for calling bullshit on the politically and criminally insane. Grow a collective set already.