Incumbent Henry Cuellar holds a strong position in the TX-28 race due to his long tenure representing the South Texas district and consistent support among Latino voters, who make up a large share of the electorate. Recent polling averages show him ahead of Republican challenger Tano Tijerina by double digits, with substantial undecided voters. Mid-decade redistricting shifted the map toward a more Republican tilt based on 2024 presidential results, and President Trump has repeatedly endorsed Tijerina while criticizing Cuellar over his decision to remain a Democrat following a 2025 pardon. Cuellar maintains a significant fundraising edge and benefits from established name recognition ahead of early voting later this month. Traders appear to weigh these structural and historical factors more heavily than the map changes or external endorsements when assessing win probabilities.