While politicians and religious leaders have been outspoken on Republican efforts to put a constitutional amendment barring same-sex marriage on the ballot next year, Friday’s Senate committee hearing included a little-heard-from voice: that of a young, straight, Republican woman who opposes the measure. In testimony lasting under three minutes, Madeline Koch , 24, identifies herself as both Republican and straight before acknowledging that up until three years ago she’d never had a gay friend. But her opposition to the measure, she said, is ideological — focused on future generations — instead of personal or partisan