Actually - it's the majority of Americans:
"This spring, the Pew Research Center found that 83% said they consider gun violence in the US a big problem -- including 50% who called it "a very big problem." Sixty-eight percent told Pew they favor a ban on assault-style weapons, while 64% favor banning high-capacity magazines that hold more than 10 rounds. Majorities also favor background checks for private and gun show sales."