I really don't have anything else to add to this. NBC weatherman Al Roker sharted himself in the White House. MAJESTIC. TMZ reports ... Roker -- who got his stomach stapled in March 2002 -- shared his most embarrassing moment on Dateline last night, saying he was covering an event at 1600 Pennsylvania Ave a month after his operation ... when he felt the urge to let one rip. Roker said, "I probably went off and ate something I wasn't supposed MORE