Pete - Mr. Mayor or The Mayor, said in a light effeminate voice
Klobuchar - Mean Amy, Crazy Amy, Salad Lady, Salad Shooter
Booker - Spartacus, Low IQ Cory
Beto - it will absolutely be BAY-toe
Liz - probably switch to calling her Lizzy when his mush brain can't pronounce Fauxcahontas anymore