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