Marni von Wilpert holds a commanding position in the CA-48 House race primarily because mid-decade redistricting shifted the open seat toward Democrats, giving the party a registration edge after longtime Republican incumbent Darrell Issa retired. A late September-to-October San Diego Union-Tribune poll showed von Wilpert widening her lead to 47-38 among likely voters as early voting began, reflecting broader national midterm trends and low approval for the Trump administration. Traders appear to view these structural and momentum factors as decisive, pricing in a strong Democratic outcome despite the race remaining on the November 3 ballot. A late surge among the remaining undecided voters or an unexpected turnout shift could still narrow the margin.