The Harris campaign has an extensive network of field offices and staff to contact voters and engage their millions of volunteers:
The Harris campaign has held a steady advantage over Trump in terms of physical resources on the ground. It has 353 field offices and over 2,500 staff members in the battleground states.
The campaign says its volunteer effort has been surging and said from Oct. 14-21, during over 124,000 shifts, volunteers knocked on 1.6 million doors and made 20 million phone calls.
CBS News, October 24, 2024
Pennsylvania Lt. Gov. Austin Davis told CBS News Philadelphia that the Harris campaign also has 36 field offices across the commonwealth.
[A Trump campaign official said they have "over two dozen offices" in Pennsylvania.]
CBS News, August 15, 2024
Meanwhile, the Trump campaign won't say how many field offices they have, but there's been lots of press coverage about their problems with paid canvassers faking voter contacts.