Slang in southern and central Minnesota for an attractive blonde hair, blue eye, girl studying Political Science. Many "Sadie Blackstads" are interested in becoming future politicians, whether senator, representative, or maybe even president. They are goal-oriented people, in their careers and personal lives.
Student #1: Did you see the Sadie Blackstad in the front row?
Student #2: Duh! I've been eyeing her since the start of lecture! I wouldn't mind letting her govern my nation! ;)