[The race for public advocate: 7 factors that will help decide who wins.]

Of the four people who have held the position since it was created in 1993, two went on to higher office (Letitia James and Bill de Blasio), and one came within a hair of becoming mayor (Mark Green — remember him?).

The fourth, Betsy Gotbaum, didn’t run for higher office but took over a nonprofit organization and was recently called “the godmother of good government.”

The office is vacant, and 17 people are running for it.

There is a special election on Tuesday, and because there is no primary, and no runoff if the top finisher gets less than 40 percent of the vote, it appears that anyone could win. A handful of votes could be decisive.

The election is also nonpartisan.

Am I registered to vote?

Check this state website.

Where do I vote?

Look up your polling location on this site, created by the School of International and Public Affairs at Columbia University.