Muni yields right now are decent in the first place. But read this article and then think this through with me:
https://finance.yahoo.com/news/us-state-tax-revenue-drops-153449185.html
Munis of certain states will increase in value when/if the state income tax rate increases. Munis are priced on a tax equivalent yield (TEY) basis. When a state tax rate is raised, the TEY for your pre-existing muni from that state heads north, raising the value of that bond.
Course you need to evaluate in advance the financial distress level and politics in (whatever) particular state you might have under consideration, then place your bets accordingly. You can be assured that's what the big money will be doing.
But given muni interest rates today are pretty good, I'm seeing this as a play with limited downside even if you guess wrong, and decent upside if the state you choose gooses their state income tax rate.