Trump’s January 2026 endorsement has positioned U.S. Representative Julia Letlow as the clear frontrunner in Louisiana’s Republican Senate primary, drawing consistent trader support reflected in her dominant market share. The endorsement capitalized on incumbent Bill Cassidy’s 2021 impeachment vote against the president, while Letlow’s House record and rapid fundraising have reinforced her lead in recent polling among Republican voters. State Treasurer John Fleming remains a distant second, drawing from his prior congressional service and Trump administration ties but lacking comparable institutional backing. A closely watched runoff on June 27 could still occur if no candidate reaches 50 percent, though current positioning leaves limited room for Fleming or Cassidy to overtake Letlow in the initial round absent major last-minute shifts in turnout or late endorsements.