So, Bernie’s going to the Vatican.
The Campaign can only spend funds to influence the outcome of the election.
If the Campaign pays for what promises to be a fairly expensive trip, is that an explicit acknowledgement that the purpose of the trip is to influence the outcome of the election?
Since Popes explicitly avoid any involvement in American elections, how’s that going to go over with His Popeness?
If any other Candidate was using the Vatican in a blatantly political way would there not be a hue and cry about it?