Julia Letlow and former congressman John Fleming will square off for the Republican runoff to win Louisiana's U.S. Senate seat.
The race picks a successor to retiring Senator Bill Cassidy.
Letlow has the support of former President Donald Trump.
Fleming says he is a challenger to the Trump‑backed candidate.
Voters have witnessed each candidates travel across the state.
The contest will reveal how much sway Trump still has with Louisiana GOP voters.
The runoff decides who will hold in the Senate next.