While I agree they all wanted to stop the certification I don't agree they all wanted to stop it in the same way and some are legal and some are not. If you're able to convince Congress to stop the certification through peaceful protest/political action I think that would be *very bad* for the country, but I would hardly say the person doing that has committed a crime and telling your congressman to do that is first amendment protected political speech.
The people who smashed in doors, attacked police, etc. most certainly did commit crimes, but I don't think there's any plausible argument that everyone else should be viewed as engaging that as well.
To me it seems like this would be more of a 'threats against government officials' thing, but I'm not informed enough about how all that works to know where the first amendment would stop protecting it.