Julia Letlow holds a commanding lead in the Republican primary for Louisiana’s U.S. Senate seat because of her strong performance in the May 16 primary, where she captured roughly 45 percent of the vote and advanced to the June 27 runoff against state Treasurer John Fleming. President Trump’s endorsement has consolidated support among voters seeking to replace incumbent Bill Cassidy, who finished third after his 2021 impeachment vote against Trump. Fleming’s share near 28-30 percent leaves Letlow positioned to expand her coalition in the runoff under Louisiana’s electoral rules. Traders reflect this dynamic in current pricing, while noting that turnout shifts or late campaign developments ahead of the June 27 contest remain the main variables that could still alter the outcome.