Teresa J. Armstrong has cast 76 recorded division votes in the current parliament, voting yea on 22 (29%) and nay on 34 (45%). Armstrong was absent for 20 votes (26% of all divisions). Armstrong voted with the winning majority 13% of the time.

In the February 2025 election, Armstrong won London—Fanshawe with 47.59% of the vote, a likely margin of +13.4% over Pete Vanderley (PC, 34.21%). Turnout in the riding was 41.27%.

Of the 76 votes, 38 were on bills and 18 were procedural motions. Opposition members typically show lower majority-alignment rates, as they vote against government bills.