If you thought Al  Gore was a media darling, you haven’t seen his latest book tour. Although  Gore has been selective in which outlets he appears on to promote his new book, “The Future,” they haven’t treated the former vice president with kid gloves.  From “Today” to “Morning Joe” to “Late Show with David Letterman” to “The Daily  Show,” Gore has come under attack by his interviewers for his decision to sell  Current TV to Al Jazeera.