“With opinions of Trump and the political environment pretty well locked in, Republican hopes of limiting big losses in the House and holding onto a slim Senate majority hinge on the possibilities that: 1) polling is failing to capture discouraged GOP voters who, while not happy with Trump, will show up on Election Day and support Republican candidates; 2) Republican campaigns are effectively identifying and targeting their low-propensity voters in ways that are not being reflected in the survey data; and 3) undecided voters, like the “doubly disenchanted” my colleague David Wasserman identified, break decidedly in Republicans favor.”