Historically, the Party That Controls the White House Has Usually

Historically, the party that controls the White House has usually lost seats in congressional midterm elections when the president is not on the ballot.Why is this the case?

A) Because presidents are usually too busy to campaign for party nominees
B) Because presidents want to seem bipartisan and above the fray while governing and, in keeping with this, usually decline to campaign for their parties
C) Because voters usually hold the president's party accountable for current problems
D) Because state, regional, or local issues become more important in midterm elections, while national issues decline in importance