Patrons take their ballots for the “Majority Vote Ice Cream Election” at Hartigan’s Ice Cream Shoppe on Tuesday afternoon. Credit: Alex Harrison As voters across Evanston and the 9th Congressional District cast ballots Tuesday to decide nominees for their next congressperson and other offices, a couple dozen people filled Hartigan’s Ice Cream at 2909 Central St. for a different election: a flavor face-off. Hartigan’s ran the “Majority Vote Ice C…