Primary voters in Maine, Nevada, North Dakota, and South Carolina will set their

parties respective line-ups for November's general election tonight.

But in one of those states, voters may also amend their Constitution to keep certain candidates off the ballot and out of Washington.

Lisa Desjardin explains.

Across North Dakota's wide landscape an unusual test of democracy's boundaries.

On Tuesday's primary ballot, a potential age limit for the state's members of Congress.

On every campaign, you know, you're going to have obviously direct mail postcards.

Political consultant, Jared Hendrix, is leading the effort.

We do think that there is a lot of wisdom that comes with age, but of course there's a limit to where, you know, we all face a decline of some kind at some point, and so we wanted to try to find the right balance. We thought 80 was the balance.

The result is measure one, an amendment to the state constitution which says

members of Congress cannot be over 80 before the end of their term,

meaning to run for a full term, a US Senate candidate

can be no more than 75 and a House candidate no more than 79. To get it on the

ballot, Hendricks, who is also running as a Republican for the state

legislature and others, gathered and submitted more than 40,000 signatures.

How did you choose the age? The reason we picked the age of 80 was simply that the support is so overwhelming at that point.

Some of the first people I talked to when I decided to take it on on my parents.

They're in their early 80s and I asked asked my dad you know how do you feel about

this and I crazy and he said you know son at my age I've got no business being in Congress.

National polls show broad concern about age.

In a recent Pew Research Center survey, a whopping 79% overall

with little partisan divide backed age limits for federal office.

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