NEW BEDFORD, Mass. (WPRI) – Former President Bill Clinton is expected to make a campaign swing in New Bedford on Tuesday to drum up support for his wife on the day of the Massachusetts presidential primary, WPRI.com has confirmed.

A person with direct knowledge of the plans confirmed that the visit was being added to Clinton’s schedule, and said the event is expected to take place midday at the Buttonwood Park Warming House. He is also expected to make a stop in Taunton.

New Bedford Mayor John Mitchell, a Democrat, endorsed Clinton last year.

Hillary Clinton’s campaign is making a major last-minute push in Massachusetts as polls show the former first lady with a slight lead over her rival, Bernie Sanders, who previously led in surveys there. Political analysts have called the Bay State a must-win for Sanders if he wants to get the Democratic presidential nomination.

New Bedford is the largest city in Bristol County, which has treated Clinton well in the past. During her 2008 primary race against Barack Obama, when she won Massachusetts by a 15-point margin, no part of the state gave her a more lopsided victory than Bristol County: Clinton took 69% of the vote there, according to CNN.

Across the county’s four cities, Clinton took 70% of the vote in New Bedford, 77% in Fall River, 72% in Taunton and 61% in Attleboro.Ted Nesi (tnesi@wpri.com) covers politics and the economy for WPRI.com. He hosts Executive Suite and writes The Saturday Morning Post. Follow him on Twitter: @tednesi