You don’t have to agree with Washington Democrats to acknowledge they are putting on a clinic in how to use power to reward their friends and punish their enemies. From canceling student debt to freeing federal pot prisoners to restricting oil and gas production to getting arch-nemesis Steve Bannon locked up, they are ending their two-year run with a bang. Their conclusion came last week when the partisan Jan. 6 committee issued a subpoena to former President Donald Trump. The timing was impeccable. After managing to stretch out the panel’s work for nearly two years, Nancy Pelosi’s worker bees saw...