Democrats and Republicans are united in opposing U.S. military strikes against Iran to retaliate for the killing of protesters amid a wave of massive demonstrations against the Iranian government in recent weeks, according to a new national poll.Seventy percent of voters questioned in a new Quinnipiac University survey said they think the U.S. should not get involved militarily in Iran, with 18% saying the U.S. should take military action.The vast majority of Independents (80%-11%) and Democrats (79%-7%), as well as a majority of Republicans (53%-35%) said the U.S. should not get involved if protesters in Iran are killed while demonstrating...