Missouri lawmakers are set to expand Gov. Jay Nixon's already historic status as the state's most overridden governor, a record the Democrat earned after years of clashing with a Legislature under virtually unchecked Republican control. Since Nixon took office in 2009, lawmakers have overridden 83 of his vetoes of bills and budget expenditures - nearly four times the combined total of all other governors' overrides dating back to Missouri's territorial days in the early 1800s.