Talk of unseating Boehner is not new, but this latest uprising is getting a jolt from the Republican presidential campaign, in which anti-establishment sentiment has driven two non-politicians, Donald Trump and Ben Carson, to the front of the pack. . . Influential Republicans say the current political environment has terrified dozens of lawmakers who support Boehner but fear that another vote to back the beleaguered speaker could lead to a backlash from conservatives in their districts. “This is a continuation of the strange virus that’s running through the Republican Party, which I define as a weird form of right-wing Marxism where people are using Saul Alinsky-type tactics,” said Rep. Devin Nunes (R-Calif.), a Boehner confidant, likening the conservatives to the late radical activist from the 1960s.