Iowa will vote on a constitutional convention question in 2020
In fourteen states, the question of whether to hold a constitutional convention is automatically referred to a statewide ballot without any requirement for a vote of the state legislature to place the question on the ballot.
The question appears on the Iowa ballot automatically every 10 years as provided by the state constitution.
From 1970 to 2010, each decennial constitutional convention question in Iowa has been rejected. On average, voters rejected the measures by 64 percent to 36 percent.

Like Iowa, four other states have a Constitutional Convention question on the statewide ballot every ten years: Alaska, Hawaii, New Hampshire, and Rhode Island. Hawaii voters decided a constitutional convention question in November 2018, rejecting it by 70 percent to 30 percent.
One state, Michigan, has a Constitutional Convention question on the statewide ballot every sixteen years. The question will next appear on Michigan's ballot in 2026.
Eight states have a Constitutional Convention question on the statewide ballot every twenty years: Connecticut, Illinois, Maryland, Missouri, Montana, New York, Ohio, and Oklahoma.
Other upcoming constitutional convention questions: Alaska (2022), Missouri (2022), New Hampshire (2022), Rhode Island (2024), Michigan (2026), Connecticut (2028), Hawaii (2028), Illinois (2028), Iowa (2030), Maryland (2030), Montana (2030), Alaska (2032), New Hampshire (2032), and Ohio (2032).
The last constitutional convention question that was approved and resulted in a convention being held was Rhode Island Proposal 1 of 1984 which led to the state holding a constitutional convention in 1986.
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