Money. Everything everyone has already mentioned takes money, a lot of money. So you can donate money to one side or withhold it from the other to influence the process.
You can also boycott or pressure businesses to take business away from the state that has done something egregious. They have moved sporting events or movie industry for example which basically enacts a multi million or multi billion dollar fine for being dick. If the event or industry would have meant reoccurring incoming this can be the most effective and immediate means of change.
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