“Vengeance”
Meaning what?
Kick your ass, revenge, retribution, retaliation, payback, requital, reprisal, satisfaction, an eye for an eye and a tooth for a tooth etc.
Just like with Republicans in Colorado the Democrat voters are very angry at the Democrat party stealing their votes with Super Delegates. The only reason to have such is to protect the party not represent the people. There is no legitimate reason to have super Delegates or unbound Delegates in a Republic other then to to protect the ruling class.
So, they can get vengeance on Hillary and the Democrats by voting for Trump who is not so bad to the majority of Americans with his positions of fixing America.