Cook Political Report (among other articles) excited Democrats and terrified Republicans by invoking the specter of a wave election flipping the House of Representatives majority control - "House Republicans Staring Into the Abyss: 10 Ratings Changes Favor Democrats":
"So many assumptions have been wrong this cycle that it's difficult to be definitive about another: that the House majority won't be in play in 2016. Republicans are sitting on their largest majority since 1928 - 247 seats to 188 - meaning Democrats would need to pick up 30 seats, a daunting challenge given the GOP's immense redistricting advantage and the vaporization of swing districts. But all cycle, Democrats have daydreamed about Republicans nominating an extremely polarizing presidential candidate, and suddenly it's almost certain they will get their wish... if November does turn into a Democratic rout, it's impossible to know just how bad it could get for Republicans sharing a ballot with Trump or Cruz."The primary evidence offered by columnist David Wasserman was a shift in the Cook Report Rating for 10 seats (5 D, 5 R) with each seat ratcheting one notch in the Democrats direction. But, there is far less here than meets the eye.