Repubs' prospect of regaining House

Politico (that so-called non partisan journalistic venture) has a Charlie Cook report (another supposedly non partisan endeavor):

The list of potentially vulnerable Democrats, according to the Cook Report, includes members who have been virtually untouchable in the past, including Rep. Dave Obey (D-Wis.), the powerful chairman of the House Appropriations Committee, and Rep. Nick Rahall, the chairman of the House Natural Resources Committee, who hasn’t faced a competitive race since 1990.