California Senator Loni Hancock and Assemblymember Mike Eng have introduced bills to let counties use Instant Runoff Voting for special elections for U.S. House and state legislature. If these bills pass, they would save money for election administrators. Almost all California special elections for those offices require two rounds of voting. Although the existing law says there should be only one round when someone gets at least 50%, it is very rare for anyone in the first round of a special election to get 50%. Virtually by definition, there is no incumbent in a special election, so it is rare for anyone to get a majority in the first round.
If the U.S. House district, or the state legislative district, is in two counties, then both counties would need to agree to use Instant Runoff Voting. The bills are AB 2732 and SB 1346 They are the first bills in California to provide for Instant Runoff Voting in partisan elections. Thanks to Dave Kadlecek for the bill numbers.