In addition to voting on local candidates, there are three propositions on the ballot Tuesday—the big one being the constitutional convention.

Once every 20 years, New Yorkers get the option to vote on whether or not to review the entire constitution and potentially make changes.

Proponents say it will hold government accountable, create more equitable election districts, and allow New Yorkers to take up issues that the legislature may not, like term limits.

Opponents say it would be a waste of taxpayer money and could roll back on collective-bargaining rights, state pensions and civil liberties.

The exact cost isn't clear. Supporters say it could be $35 million, but opponents say it could be upwards of $350 million.

"Ideally, if revenues keep coming in, it's something the state could afford. I don't think this means that if it goes through and people vote for it, that they're going to see thousands of dollars in their property tax bill go up. That's not how it's going to work," said Dr. Thomas Chambers, Niagara University history professor.

"If we spend money on a constitutional convention that we don't need, we spend less money on things like roads, and education, and health care, and all the other services that are provided by the New York State government," said Richard Lipsitz, WNY AFL-CIO president.

If approved, the constitutional convention would start in April 2019.