Ted Cruz leads named contenders in this market at 41.5% because he has actively tested the waters through recent Iowa travel, book promotion, and public statements affirming presidential ambitions ahead of the 2028 cycle. No major Republican has formally announced, leaving "Other" at 50% as traders weigh the possibility of an unlisted figure or lesser-known candidate moving first. The field remains tight among figures such as Rand Paul, Marjorie Taylor Greene, and Vivek Ramaswamy due to shared caution around the November 2026 midterms and potential White House signals on succession. Developments like exploratory steps, early-state visits, or explicit declarations in coming months could quickly shift probabilities before formal campaigns begin in earnest.