John Kerry is now Secretary of State, and today was his first day at the office in Foggy Bottom. In his welcome remarks to department employees, the former senator expressed his excitement about his new post. "Here we can do the best of things that you can do in government. That's what excites me. We get to try to make our nation safer. We get to try to make peace in the world, a world where there is far too much conflict." Michael Kranish, chief of the Boston Globe's Washington bureau, is co-author of John F. Kerry: The Complete Biography by the Boston Globe Reporters Who Know Him Best, which is being released as an e-book today.