of courses? extra "s" ?

Police Chief, and most of the police in Rochester, N.Y., have resigned. The Democrat Mayor and, of courses, Governor Cuomo, have no idea what to do. New York State is a mess - No Money, High Taxes & Crime, Everyone Fleeing. November 3rd. We can fix it!

https://twitter.com/realDonaldTrump/status/1303458451671011328