For all their disagreements, sources on both leading New York City mayoral primary campaigns tell CNN their assessment going into Election Day is the same: jump ball.

The winner of the Democratic primary will face Adams, Republican candidate Curtis Sliwa, and independent candidate Jim Walden come November, but is likely to become the next leader of the city, which has selected a Democrat in the past three mayoral elections. Polls are open in the city until 9 p.m.

Voters on Tuesday are heading to the polls to cast ballots in the increasingly dramatic Democratic primary contest for New York City mayor. The race has emerged as a nail-biter between former New