Republican National Committee Chairman Reince Priebus on Tuesday blasted Democrats for seemingly taking a shot at Mitt Romney during a tribute to the late Ted Kennedy. 

A video tribute to former Sen. Kennedy (D-Mass.) shown at the Democratic National Convention on Tuesday night included clips of a debate between Kennedy and Mitt Romney, who challenged him for the Senate seat in 1994. In the clip, Kennedy accused Romney of being a flip-flopper.

Priebus called it "classless."