In North Dakota, Republican incumbent John Hoeven was considered a safe bet to win his third term by defeating Tim Mathern, a Democratic state senator.
CNN: Dems win two open governor races, make history in N.C.
2.
For six years, Mr Mathern has attempted to correct the constitution, although he says he was always defeated by colleagues who dismissed it as a waste of time.
BBC: Who, what, why: Is North Dakota really a US state?
3.
It doesn't bring the statehood into question, says Mr Mathern, because the Supreme Court would rule in favour of North Dakota being a state, although it's a flaw that needs fixing.
BBC: Who, what, why: Is North Dakota really a US state?