In 2016, in a precinct in Florida a young woman Clinton campaign worker was giving out cupcakes with Hillary Clinton’s picture on them. In spite of the likelihood that could have been considered campaigning within a polling place, election officials let it slide.
At one point, cupcake girl started to leave the polling place claiming she needed to get more cupcakes from her car. On her way out a Bernie campaign poll watcher stopped her because she wasn’t just holding an empty pan, she was holding a folder. On closer inspection the folder she was leaving with was full of uncounted Bernie ballots. She wasn’t able to leave with them but I have heard nothing of any further legal action against her for the attempted crime.
Keep an eye out for similar election fraud if you are at the polls.