For Barack Obama, there's a presidential library to build, hundreds of millions of dollars to raise, causes to champion and a book to write. At 55, Obama will be a relatively young ex-president, with plenty of time for a second act. "I think it's appropriate for me to give advice, because I need some sleep," Obama told NPR last month. "If there's anyone who could stand up to a President Trump, it's going to be former President Obama." It won't be long until Obama and his wife start raising money for the Barack Obama Foundation, which is developing his presidential library and center in Chicago.

Source: ABC News January 14, 2017 15:40 UTC