The July 13 by-election to fill the District 16 Cornwall-Meadowbank seat, vacated by the March death of Progressive Conservative MLA Mark McLane, features a short campaign window that has produced closely matched probabilities across major-party nominees. Caley McDonald for the PCs, Liberal leader Robert Mitchell, Green candidate Tayte Willows, and NDP nominee Craig Nash each draw comparable trader support, reflecting the absence of recent district-specific polling and the influence of local voter turnout patterns in a riding previously held by the governing PCs. Party machinery, candidate visibility during advance voting, and any late endorsements or turnout efforts in the final days remain the primary variables that could shift implied probabilities before election night.