From left: Rep. Rob Bresnahan (R-Pa.) with House Speaker Mike Johnson (R-La.), Reps. Lisa McClain (R-Mich.) and Carlos Giménez (R-Fla.) during a campaign event for Bresnahan in Hazleton, Pa., Oct. 6, 2026. (Rachel Wisniewski/The New York Times) By REID J. EPSTEIN The Republican Party’s hopes of saving its majorities in Congress increasingly appear to depend on a few possible outcomes: GOP advantages in money and on the map pay off, the polls are wrong, or a major news development suddenly…