House Republicans face at least three possibilities where incumbents will vacate seats in highly Democratic districts, The Hill reports.
Rep. Jim Gerlach's (R-PA) decision to run for governor of Pennsylvania
Rep. Mark Kirk's (R-IL) expected announcement that he will run for Senate
Rep. Mike Castle's (R-DE) possible retirement or run for Senate
"What it means is, even if the Democratic waves of the last two cycles break, Democrats could still be favored to add a few seats that would offset any losses."