I was able to confirm today that Sen. John McCain is now accompanied by a security detail from the US Secret Service. There had been some speculation earlier in the campaign as to who was providing security for Sen. McCain, as he had previously refused Secret Service protection.
Sen. McCain was in Portland, Oregon on a campaign stop, and the Secret Service detail was using 165.3750 MHz (CHARLIE), P-25 mode. I was unable to snag the call sign for Sen. McCain.