President John Samuelsen listens at left as Democratic presidential candidate, Sen. Bernie Sanders, I-Vt. speaks after being endorsed by TWU Local 100 (AP Photo/Mary Altaffer)

Hillary Clinton and Bernie Sanders are campaigning throughout New York City today ahead of the state's primary next week.

Sanders predicted victory as he appeared with members of a transit workers union, before joining a picket line with communications workers striking against Verizon. He picked up the support of the transit union, providing him with a small army of workers who could pass out leaflets in subways in the days ahead.

Clinton today is again reaching out to the city's black community with a speech to the organization led by the Rev. Al Sharpton.

New York City offers by far the largest bloc of votes in next Tuesday's primary, and campaign officials estimate it could account for about 70 percent of the vote. In 2008, when Clinton dueled Barack Obama in the state's primary, more than half of the vote came from the city's five boroughs.

Polls have shown Clinton with a lead against Sanders, putting pressure on Sanders to overcome Clinton's edge.

Sign up for the Newsletter

Get the best of delivered to your inbox every day.

(Copyright 2016 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed)