Next Tuesday, voters in Maine and more than a dozen other states will cast ballots during the single-largest primary day of the 2024 elections.By presidential primary standards, this year’s Super Tuesday contests are relatively anti-climactic because the Republican and Democratic tickets are pretty much set at this point. Absent some ground-shaking legal or political developments, the nation appears headed for a Biden-Trump rematch this November.But electors are still at stake in Maine. And for the first time this year, thanks to Maine’s switch to a “semi-open” primary, independent voters can join the proverbial party without literally having to join a party.