From the New York Times..
He then showed up at a library in Newton, Mr. Galvin said, and the poll workers were flummoxed.
“We had to remind everybody what the rules are, that there is no campaigning within 150 feet of the voting booths because people are entitled to their privacy,” Mr. Galvin said. “And it’s not just him but his media entourage.”
Because of the situation in Newton, Mr. Galvin said that his office called ahead to Mr. Clinton’s next stop, in New Bedford, to remind those poll workers of the rules.
“He can go in, but he can’t approach voters,” Mr. Galvin said. “We just took the extra precaution of telling them because this is not a usual occurrence. You don’t usually get a president doing this.”