The Democratic candidates for governor are concentrating on vote-rich Philadelphia on their last full day of the primary campaign.

All four candidates are scheduled to spend some or all of Monday meeting voters at train stations, businesses and shopping malls.

Front-runner Tom Wolf appeared in Lancaster before heading to Philadelphia to meet commuters at Suburban Station.

Congresswoman Allyson Schwartz, state Treasurer Rob McCord and former state environmental protection secretary Katie McGinty all plan to spend the day campaigning in the state's largest city, where one in five Pennsylvania Democrats live.

McCord also is appearing at an evening labor union rally in Montgomery County.

Polls open at 7 a.m. and close at 8 p.m. in Tuesday's primary election. About one in four of Pennsylvania 4.1 million Democrats are expected to vote.