This snippet can tell you a few very critical things
1.) America's center-left and left finally got organized and got some money behind themselves.
2.) The Republican candidate likely thought that Roem didn't have a snowball's chance in hell, and that was a huge mistake.
3.), and this is the most important one: When people meet a trans person, in real life, in the flesh, they realize that we're not the monsters the fearmongers make us out to be. they realize that we're just like them, and that being trans is the least interesting thing about us.
I doubt that it was Moen knocking on all 75,000 of those doors, but even a small amount, combined with all of the public appearances, and the focus on issues shows that we can convince people that we're not the monsters.
The other big thing is that she didn't really engage Marshall on the cultural issues, and instead focused on local ones (like traffic congestion, which is a huge problem in that part of the state).
See my post about the election here: