I think the meaning is fairly obvious; an imperfect ally is better than an all-out enemy. If you wanna do politics, you need to learn who you can safely ally with, who your actual friends are, and who will always be your enemy.
Edit: oh wow, look at all those comments on ML. I wonder why this person would object to lesser evil rhetoric favoring the democrats.
Was this released in 2022? No? Why does the tittle say “already”, then?