So, you need 27. The list of states without two Republican Senators that haven't yet voted on it are: AZ, CA, CO, HI, IL, ME, MI, MN, NM, NV, OR, WA, WI
States with two Republican Senators that previously approved it are: KY, NC, SC. I could see KY and SC voting to overturn their previous vote if it looked close. States without two Republican Senators that previously voted against it are: CT, DE, GA, MA. I don't see GA overturning their previous vote, and CT and MA are both small states with > 3 billionaires per million people. Alaska does ranked choice voting, and Nebraska does proportional electors, so they might try something different. Good luck getting to 27.