TALLAHASSEE, Fla. — The chants of dozens of students from across Florida could be heard through the walls of the Senate chamber on Monday as lawmakers debated a contentious proposal to bar lessons about sexual orientation and gender identity from kindergarten to third grade. “We say gay!” “We say gay!” “We say gay!” A day later, a emotionally divided Senate voted 22 to 17 to pass the measure — dubbed the “don’t say gay” bill by opponents and the “parental rights in education” bill by Republican backers. Two Republicans, Sens. Jeff Brandes and Jennifer Bradley, voted against the measure with De…