A fascinating article appeared last week in mlive.com by Fritz Klug under the headline "Actually, 'Michigander' was used before Abraham Lincoln's speech". You can find it here: MLive
The essence of the issue in this piece is whether Lincoln was the first to coin the term. The article lays out the historiography to show that "Michigander" was in use before Lincoln's use of it to cast some, well, let's say, humorous criticism upon Lewis Cass. The evidence is clear that he did not invent the term.
That isn't a point yours truly is or has been stuck on. The point is this: the 16th President used the term, used it in a classically Lincolnian way (notice, not "Lincolngander" way), and if one must choose which term (the other being the prosaic "Michiganian") to use as a matter of course, my vote is to tie ourselves to Lincoln and not to a term as commonplace and indistinct as "Floridian" or "Vermonter". Rather, we can associate our Great Lake State and the common term to use for its inhabitants with the greatest U.S. president (IMHO).
Much better to be a Michigander, to be immersed in history when we think of what to call ourselves -- and remember to pronounce it just as one pronounces the name of the State, with emphasis on the first syllable, not the third, and with "en" not "an". Much poorer to use a term that is already in use as the title of a publication or a word ending that fails to represent our unique nature.
Michigander -- that's what Lincoln called us, even though he didn't coin the term -- is altogether good enough for this space.