(CNN) Voters in three deep-red states went around their elected representatives to approve Medicaid expansion at the ballot box Tuesday.

Idaho , Nebraska and Utah residents all supported measures that extend Medicaid to residents with incomes up to 138% of the federal poverty line.

The grassroots efforts will provide coverage to hundreds of thousands of people and could take effect as early as the spring.

Democratic victories in several gubernatorial races also raise the likelihood of Medicaid expansion in additional states.

Maine's newly elected Democratic governor Janet Mills is expected to push through Medicaid expansion that was approved last year by voters in a first-of-its-kind ballot measure that was blocked by outgoing Republican Gov. Paul LePage. Mills will have the support of both state houses since Democrats also won control of Maine's Senate.

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