Police unions don't play around either. If a politician were to play hardball, some small town or another would just go without a police force at all until it cried uncle, anyone at the state level trying it would simply see insane amounts of cash dumped on their rivals' campaigns and lose, and Congress can't even muster up the ambition to pass feel-good-do-nothing resolutions on its best day, not even one of which we've had since either of us became adults.
Oh, but that's a little different. Worse of course, not different for the better.
As states do prohibit asset forfeiture, the FBI can dangle it back in front of the locals with their "sharing" program. It's the federal government interfering with state sovereignty to undermine it. They've soft-federalized every single municipal police department and every sheriff's office in one fell swoop.
CAF inverts all of these. They take your stuff, sometimes they allow you an administrative hearing, and the burden of proof is on you to prove that the stuff is actually yours.
Left/right politicians will lean in the generally expected directions on what things they would stop with it and what ways they would responsibly use the proceeds, but reasonable people could be convinced that the only problem with civil asset forfeiture is that it doesn't protect the innocent from its consequences -- and that's not too far off the mark, but that it can be used without having to wait for its victims to have exhausted the appeals process to it at first is the cancer from which all its other ills originate