In Presidential Election years: held on 1st Tuesday in March (2004, 2008).
In Gubernatorial Election years: held on 2nd Tuesday after 1st Monday in September (2006, 2010).
Held on 1st Tuesday after 1st Monday in November in even-numbered years (2004, 2006).
Held in the year after Gubernatorial Election, on 2nd Tuesday after 1st Monday in September (2003, 2007).
Held on 1st Tuesday after 1st Monday in November in even-numbered years (2004, 2006).
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