Treason re: Michigan Constitution and "Half" Whitmer
Sec. 30. Treason against the state shall consist only in levying war against [it], or in adhering to its enemies, giving them aid and comfort. No person shall be convicted of treason unless upon the testimony of two witnesses to the same overt act, or on confession in open court.
http://www.legislature.mi.gov/documents/historical/miconstitution1850.htm