Michigander
"Michigander" is a demonym for residents of the State of Michigan. It coexists with the word "Michiganian". Unlike "Michiganian", "Michigander" was originally pejorative. It has since lost its negative connotation.
The word Michigander is attributed to none other than Abraham Lincoln, when he was a Whig representative in Congress. On July 27, 1848, Lincoln made a speech against Lewis Cass, the first governor of the Michigan Territory. Cass was running for president on a “popular sovereignty" platform that would have let states conquered in the Mexican War decide whether or not to legalize slavery. Lincoln accused the Democrats of campaigning on the former President Andrew Jackson's coattails by playing up their own their military accomplishments.
Origin
Lincoln thus combined the word "Michigan" with the word "gander" to form a nickname that made Cass sounds foolish like a goose. Never the less many Michigan residents prefered the sound of the word "Michigander" to the word "Michiganian", and the word remains popular to this day.