Anytime a Democrat tries to tell you the Republicans are dominated by Tea Party extremists, don't let them forget they have their own brand of lunatic extremists pulling their party firmly into residency status in Crazy Town.
Democrat activists shouted down Presidential candidate, former Maryland Governor Martin O'Malley and took over the stage when he made the innocuous and entirely reasonable statement "all lives matter."
"Black Lives Matter" campaigners adopted Occupy Wall Street cult idiocy of repeating en masse the words of speakers who denounced O'Malley's call for the recognition of the importance of according all people basic legal and human rights.
O'Malley later apologized for saying "all lives matter." Which hopefully just means that he is a spineless political panderer rather than coming to the view that not all lives matter, or that the lives of some innocent Americans should matter more than others.