This is a problem between the office of president and the Secret Service. Obama is just the current occupant of that office.
And it's not even the president. DC has become an armed camp. Dick Cheney used to go into the White House early every morning between 5 and 6. How do I know that? Because of the screaming sirens and large motorcade it took just to get him across town. Five O'Clock in the morning, and they need sirens to clear the streets. Guys I knew who had military experience were getting carry licenses and working part-time as armed security for 2nd and 3rd tier government and foreign government officials. It wouldn't be unusual to have a dozen or more different police forces all operating over top of each other in any one spot -- and then you had all the private security guys on top of that.
It was crazy back in 05, and each year they just keep adding a little more. It's so bad that I think the best thing if they want to keep it up like this is to just get rid of all housing, ground transportation, and local government in DC entirely. Make it some kind of National Urban Park or something.
And it was more-so under Bush than under any previous president, and under Clinton, and (I don't remember Reagan very well, but I suspect) under Bush as well.
Dude, seriously, The Queen of England doesn't cause as much disruption to London as Obama causes wherever he goes, and she actually is royalty.