Democratic presidential candidate South Bend, Ind., Mayor Pete Buttigieg (center), speaks while Sens. Amy Klobuchar and Bernie Sanders listen during the Democratic presidential debate in Detroit on Tuesday. All three agree on the need to ban assault-style weapons and for a universal background check for gun buyers.

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Democratic presidential candidate South Bend, Ind., Mayor Pete Buttigieg (center), speaks while Sens. Amy Klobuchar and Bernie Sanders listen during the Democratic presidential debate in Detroit on Tuesday. All three agree on the need to ban assault-style weapons and for a universal background check for gun buyer