Incumbent Mike Johnson holds a commanding position heading into Louisiana’s November 3, 2026 nonpartisan primary for the 4th congressional district. The solidly Republican seat and Johnson’s prior 85.8 percent primary performance against minimal opposition make an outright first-round majority highly probable under the state’s jungle primary rules. Multiple challengers, including Democratic candidates Conrad Cable and Matthew Gromlich plus Republican contenders Gordon Heslop and Mike Nichols, filed by the August 7 deadline yet lack the resources or visibility to consolidate enough votes for a runoff. Trader consensus reflected in the 93 percent implied probability aligns with the district’s partisan composition and historical voting patterns. Late developments such as an unforeseen scandal or dramatic turnout shift remain the primary risks that could alter the outcome.