Residents will head to the polls Tuesday to vote for New York City's next mayor, City Council members, public advocate and other positions.

For the mayoral vote, incumbent Bill de Blasio is looking to defend his post against six challengers.

Voters will also see three proposals on the ballot. Proposal No. 1 calls for a state constitutional convention, which is a question voters are faced with every 20 years. If a majority of citizens votes yes, delegates would meet in Albany in April 2019 to come up with amendments that would go on the ballot for voters to approve the following November.

Tony Utano, president of TWU Local 100, the state's transportation workers union, is running campaign against the convention.

"I'm asking my workers to make sure they go to the polls tomorrow -- turn that ballot around -- because the question is on the back -- and vote no for Proposition 1," he says.

Boris Heersink, assistant professor of political science at Fordham University, says a "yes" vote could hurt unions.

"If you have a convention, there might be a situation where some of the rights and achievements that unions have built up over the years will be taken away," he says.

That could include cutting certain protections like guaranteed pensions.

Proposal No. 2 would make crooked politicians pay. It would allow a court to reduce or revoke the pensions of elected officials if they are convicted of certain felonies.

And Proposal No. 3 has to do with the preserved forest lands in the Adirondack and Catskill mountains. It would allow towns to use that land for crucial projects when there is no other viable alternative. The land use would be limited to 250 acres.