Trump's endorsements in the 2026 Republican primary cycle have shown strong influence, with endorsed candidates winning 97% of races so far across congressional, state legislative, and executive contests—slightly below the 2020 rate. Recent developments include a double-down video endorsement for Wyoming gubernatorial candidate Megan Degenfelder ahead of the August 18 primary, ongoing jockeying in races like Missouri's 5th District, and earlier signals around Texas Senate contenders. Traders monitor White House communications, America First alignment, and candidate competency as key signals, with upcoming primaries and any late announcements likely to shift implied probabilities in active endorsement markets.