Impeachment polls and the risk of a self-fulfilling prophecy

The impeachment story is moving on. Today, the Democratic-led House Intelligence Committee will publish its report on President Trump’s dealings with Ukraine and turn things over to the Judiciary Committee, which will hold its first public hearing on impeachment tomorrow. Key facets of the report aren’t known yet, but it’s sure to conclude that Trump improperly leveraged the presidency for personal political gain. “Prebutting” that finding, House Republicans moved to muddy the narrative by...