Democrats are running as the opposition party
John J. Pitney, Jr. writes: In a typical midterm election, the party not holding the presidency casts itself as a check on the incumbent administration, even more so when the president’s party controls both chambers of Congress. The elections of 1994, 2006, 2010, and 2018 all started with unified government and all ended with the out-party winning control of the House (and the Senate in 1994). The in-party has never been able to wear the “check and balance” mantle—until this…