—Shutdowns tend to have short-lived effects on e.g. approval ratings
—Too early for approval ratings to be predictive of re-election odds, anyway
—Lots of news so everyone will forget about it once some Mueller shit happens
—No sign of an end to the shutdown, and it's the longest shutdown ever, so past precedent not hugely useful here
—It's fraying Trump's relationship with Congressional GOP
—Doubling down on the base instead of pivoting to the middle is probably a dumb 2020 strategy