Like every chief executive before him, President-elect Barack Obama will be making personal sacrifices as he assumes the role of U.S. president. He won’t be able to stroll down a beach without the world watching. He will likely worry over how his daughters will adjust to living in a fishbowl. He may end his term, or terms, with a lot more gray in his hair than he would have picked up as a senator. He will almost certainly have to give up his beloved BlackBerry. Past presidents probably can’t relate to the pain that’s going to cause.