Suzan DelBene’s long incumbency in Washington’s 1st Congressional District, a reliably Democratic seat covering northern Seattle suburbs, underpins trader consensus reflected in her 95.5% implied probability. She secured the top-two primary spot in August with roughly 53-54% of the vote against a fragmented field, while Republican Mary Silva advanced second with about 26-27%. Forecasters across Cook, Sabato’s Crystal Ball, and Decision Desk HQ rate the race Solid or Safe Democratic, consistent with DelBene’s 63% general-election margin in 2024. Silva’s limited fundraising and profile have not altered the structural advantage. A major national political shift, candidate health event, or unusually low Democratic turnout could narrow the outcome, though no such developments have emerged in the weeks before the November 3 general election.