AUGUSTA — Maine’s top election official predicts a turnout of about 35 percent of eligible voters in the statewide referendum balloting.

Secretary of State Charlie Summers says his prediction for Tuesday is a rough average of turnouts in other off-year elections without big candidate races.

Turnout in 2009 in the referendum featuring a same-sex marriage proposal was 55 percent, but it was less than half that in 1993 when voters approved legislative term limits.

Summers expects turnout to be buoyed by some of the campaigns in the gaming questions. He also believes “loyalists” on both sides will make a strong showing at the polls.

Mainers will decide questions on voter registration, racino and casino gambling and a constitutional amendment.