It's been more than a week since polls closed in New York City, but there is still no call on the Democratic primary results that will likely determine the next mayor of America's largest city. A new system of voting called ranked choice has been one cause for the wait. Christina Greer, a professor of political science at Fordham university, joins Yamiche Alcindor to discuss.

Stream your PBS favorites with the PBS app: https://to.pbs.org/2Jb8twG
Find more from PBS NewsHour at https://www.pbs.org/newshour
Subscribe to our YouTube channel: https://bit.ly/2HfsCD6

Follow us:
Facebook: http://www.pbs.org/newshour
Twitter: http://www.twitter.com/newshour
Instagram: http://www.instagram.com/newshour

Subscribe:
PBS NewsHour podcasts: https://www.pbs.org/newshour/podcasts
Newsletters: https://www.pbs.org/newshour/subscribe