Canvassing is the systematic initiation of direct contact with individuals, commonly used during political campaigns. Campaigners knock on doors to contact people personally. It is used by political parties and issue groups to identify supporters, persuade the undecided, and add voters to the voters list through voter registration, and it is central to get out the vote operations. It is the core element of what political campaigns call the ›ground game‹ or ›field‹.
[Blue Donkey & Red Elephant – Episode #11]