Find out if there’s a runoff in your district, and check out our medical cannabis voter guide.In South Carolina’s June 9 primary, no candidate topped 50% of the vote in three state Senate and eight state House districts. Those races head to a runoff tomorrow — Tuesday, June 23. If you live in one of the districts headed to a runoff, check out our voter guide and make a plan to vote.The districts with runoffs are:S.C. Senate districts: 16 (Republican), 33 (Republican), and 39 (Democrat)S.C. House…