The process of choosing a presidential favorite has led Michigan down many different paths since it held its first presidential primary in 1916.
In 1972, Alabama Governor George Wallace won the Democratic primary, easily beating George McGovern and Hubert Humphrey.
That prompted Democratic complaints that Republican voters had crossed over to vote for Wallace to embarrass them.
Democrats later switched to a caucus system that required participants to declare their party preference.
On January 15th, primary voters will have to declare their preference, but only the political parties will get that information.