Recent Republican midterm losses in both chambers have weighed on trader sentiment for J.D. Vance’s 2028 GOP nomination prospects, driving his prediction-market share down to roughly 32 percent as of early November. Post-election positioning has accelerated interest in alternatives such as Ron DeSantis, whose odds have risen sharply, while Vance’s own comments about possibly declining to run and his distance from certain administration policies have added uncertainty. Early primary polling still shows Vance ahead, yet the wisdom of crowds reflected in current pricing incorporates these risks and historical patterns of vice-presidential succession after midterm setbacks. No major scheduled events immediately ahead are expected to alter the field before year-end, leaving room for further movement based on donor signals, public statements, or polling trends through December.