Vermont Senator Bernie Sanders is accusing a liberal think tank of attacking the progressive wing of the party. Last night on 60 Minutes Nancy Pelosi took a swipe at the influence of progressive members of congress saying the wing of Rep. Alexandria Ocasio-Cortez and other progressive freshman Democrats is "like five people." Last week Former President Barack Obama warned Democrats about the dangers of rigid ideological dogmatism, which he said can lead to a "circular firing squad." Have they failed to heed his advice?