I suppose you could accuse individuals at the city or state level, but it would not be as effective as doing it at the Federal level.
Use Trump's tactics as an example: do it and let the courts sort it out. However, Trump, as president, has the ace card: Insurrection Act. No doubt he would invoke it and claim Pritzker is an insurrectionist. This is something that Trump WILL do at some point. It may be better to force his hand before he is ready to play it. If he played it just prior to the elections, there may not be sufficient time for the courts to react to put an end to his efforts.
House Speaker: Shutdown Could Be Longest in US History
I believe it will be. Both dems and repubs are dug in. The drastic price increases in Obamacare premiums will work in the dems favor with 70% of the people affected by it living in red states. The repubs would have had to do something anyway so by bringing the attention to the issue now demonstrates to the public that dems are looking out for them.