"Why not resign like Bob Livingston?”In the hours before House Majority Leader Kevin McCarthy (R-Calif.) abruptly withdrew his candidacy to be the next speaker of the House, he was sent an email from a conservative activist threatening to expose an alleged affair with a colleague. The subject line: “Kevin, why not resign like Bob Livingston?” The email, sent just after 8 a.m. on Thursday, came from Steve Baer, a Chicago-based GOP donor known for mass-emailing conservative figures and Republican lawmakers. It was addressed to McCarthy and numerous others, including the personal account of Rep. Renee Ellmers (R-N.C.), who conservative media...