Democratic presidential candidates are starting to go after each other with greater ferocity.
Pete Buttigieg launched an ad attacking proposals from Sens.
Elizabeth Warren and Bernie Sanders.
CNN reports Mayor Buttigieg went after the idea of universal free college tuition.
I believe we should move to make college affordable for everybody.
... I only want to make promises that we can keep.
Mayor Pete Buttigieg The mayor's critics have pounced on this line of attack.
New York Rep.