DACA negotiations reveal consequences of Democrats' increasingly radical base

Negotiations over the Deferred Action for Childhood Arrivals program are complicated, but at their most basic level involve Democrats asking Republicans to codify protections for Dreamers and Republicans asking Democrats to allocate more resources to border security in exchange for those protections.

In a midterm election year where Democrats, especially in the Senate, are defending key seats in states the Republican president won last cycle, you would think funding border security — or supporting provisions on chain migration and the diversity lottery — would be a common-sense decision.