Knowns and unknowns in the race for the House

Knowns and unknowns in the race for the House-politico: As the 2014 House election enters its final hours, this much is certain: Republicans will retain control of the chamber, and perhaps win their largest majority since the 1940s. After that, there are all sorts of wild cards. Will this election season — which already saw House Majority Leader Eric Cantor lose his primary — produce any more upsets? Will Republicans succeed in adding diversity to their ranks? Will a GOP-friendly environment enable the party to make inroads in the Northeast?