Ward 49 and Ward 66 are two big voting precincts in Madison. Ward 65, where I vote, has 2.819 registered voters. Ward 49, in the campus area with tons of undergrad-heavy high rises, has 3,505.
In the 2018 governor’s race, Ward 65 went for Tony Evers 2190-179. Ward 49 also went big for Evers, though not as dominantly: he won there 1985-591.
Now look at the April 2019 Supreme Court election. Ward 65 went strongly for the more liberal candidate, Lisa Neubauer, voting for her by a 1631-103 margin. Ward 49 also liked Neubauer but the margin was 531-101. 25% more voters but about a third as many votes. Evers narrowly won his election. Neubauer narrowly lost hers. Young voters sitting out downballot elections is pretty important.