Trump’s endorsement of Rep. Julia Letlow has consolidated Republican primary voter support behind her in the race for Louisiana’s U.S. Senate nomination, driving trader consensus toward her decisive first-round lead. Incumbent Sen. Bill Cassidy’s past votes against Trump and policy differences with the administration have limited his appeal among the party base, while state Treasurer John Fleming’s self-funded effort splits remaining anti-Cassidy votes without overtaking Letlow. With the May 16 primary underway and no candidate expected to reach a majority, the top two will advance to a June 27 runoff. Letlow’s position could still face pressure from unusually high undecided turnout or last-minute developments that shift conservative mobilization in the final hours of voting.