You'll forgive my cynicism, but judging by the posts I've read of people encountering police lately and they are sporting their blue lives bands...
I think you're assuming the law will be interacting with the people causing the disturbances, and NOT the people being disturbed.
I have my doubts.
I sure get that but I wouldn't lump the FBI and state police with local law enforcement. Where I live, the former have generally avoided all partisan public utterances. However, some of the sheriff's deputies have occasionally made their politics pretty clear without making an explicit reference to a candidate for high office.
For example in the runup to 2016 elections, there were some remarks (to the local press no less!) by a couple sheriff's deputies in a few counties around here like
if you still want to get another gun this would be the time to do it.
The state troopers in NYS would never say something like that to the press even if some might think it. Sheriff's deputies who subscribe to selective enforcement of laws that they may not care for, though, can be a whole other story in the USA in recent years. I'm not saying any of them around here would brag on being members of the CSPOA (Constitutional Sheriffs and Peace Officers Association) but some have been explicit about not meaning to work very hard to enforce assorted provisions of NY's
SAFE Act.
I get the impression that state troopers in rural areas here try to work with elected officials like mayors or city councils etc if they think there could be a problem with local law enforcement taking some kind of quasi-judicial or extralegal approach to enforcement of any law... in other words they make an effort not to get into some kind of confrontation with another branch of law enforcement themselves.
Personally it's my opinion though that the state troopers here would not stand around watching a Trump caravan try to disrupt anyone's access to polls tomorrow. They didn't stand around when some out of state Trump fans had threatened to come up here and "do something" about a peaceful Muslim community in the area back when Trump was busy tweeting insults to The Squad. They said no threats to any citizens would be tolerated, and they did tacitly accept an influx of local bikers supportive of the community, guys who happend to surround the area in the weekend before the planned "event"... which petered out into a nothingburger.
On the other hand it's hard to know where to draw the line when political protest moves from on-foot to in-cars. It's not a leap to say that's a prelude to domestic terrorism, since we've already seen instances and attempted instances of cars used as weapons of terror, and an ensuing bulking up of protections of walkways and bike paths etc against such behavior.
Still, blocking highways with caravans of vehicles driven by partisans is a relatively new form of "free speech" in the USA. I suppose that we may end up having to suffer through these idiots' realization that duh, you can be busted for not having a valid plate and reggie on a vehicle, and that duh, when you're driving a registered lethal weapon, you own whatever you do with it.
The question then comes down to whaddya gonna do about the potential for a short-lived but massive voter intimidation effort via vehicle caravans in select locations. By the time those tickets land someone in court or with a bench warrant, who the hell knows how many votes were suppressed.]
It's hard to figure that America "won't tolerate" stuff like that even if some officials mouth those words and even mean it. Sure we booted out enough House members in 2018 to flip the chamber, but that doesn't help us enough right now when we're looking at the remnants of a lawless party wink and nod at all manner of voter suppression efforts by their nominal leader and some of the rowdier elements of his base.