Then, there were Reps. Don Sherwood (who lost his reelection bid) and Mark Foley (who resigned) in 2006. Democrats briefly even held a filibuster-proof Senate majority in 2009. In addition to gerrymandering and increased political polarization, both parties have had multiple wave or near-wave elections since 2006, taking over the other side’s most vulnerable districts. The House has changed control four times since 2006, the Senate seven times since the 1994 elections. The party that holds the White House has lost congressional seats in all but two midterm elections dating back to 1938.