In the period leading into the 2026 midterm primaries, Donald Trump's endorsement choices in Republican Senate and House races continue to shape candidate positioning and trader assessments of likely outcomes. His past support has often aligned with frontrunners in contested nominations, reflecting voter preferences in many districts. Markets reflect ongoing uncertainty around specific races, including potential announcements in states with upcoming filing deadlines or early voting. No major new endorsements or shifts in public positioning have been confirmed in the past 30 days, leaving probabilities tied to campaign events, polling trends, and any direct statements from Trump or his allies through the fall.