When the president travels, there is a full entourage of personnel and equipment that goes with him.
It's pretty crazy actually. Of course though that is for international travel. Doubt that it's too different for national travel. Still have to transport the limos, secret service vehicles etc. then usually hire local police escort. All the staff that accompanies the president needs places to sleep. Etc. adds up really fast.
The thing that pisses me off is that tax payer money is paying this jack ass for his staff to stay at his hotel, all that should be f***ing comped.
http://www.politicaldog101.com/2012/06/22/when-presidents-travel/