Elon Musk and Charlie Kirk taking over the Trump field operations may be one of the worst decisions he’s made and that’s saying something: Donald Trump’s ground game in Arizona and Nevada may be undercut by canvassers working for America Pac using GPS spoofing to pretend they have knocked on doors when they haven’t, according to multiple people familiar with the practice and a leaked how-to-fake-location video. The ramifications for Trump may be far reaching, given America Pac has taken on the bulk of the Trump campaign’s ground game in the battleground states, and the election increasingly appears set to be decided by turnout. A bootleg how-to-spoof video, made by an America Pac canvasser in Nevada and obtained by the Guardian, shows the apparent ease with which locations can be changed to fake door-knocks, calling into question how many Trump voters have actually been reached by the field operation. The video, shared with a few hundred canvassers, walks through the setup: a user downloads a GPS-spoofing app to falsely place themself at the door of a Trump voter, fakes responses to the survey and takes steps to cover up the fraud by varying the survey responses to make it believable. The scope of the GPS-spoofing practice is unclear because it is difficult to catch cheaters without cross-referencing data with another tracker. It is also not a problem limited to America Pac; GPS spoofing has been a problem for years and it has become increasingly resource-intensive to catch cheaters. […] The video comes as America…