West Wing creator Aaron Sorkin is taking some sassy potshots at departing cast member Rob Lowe. In the current issue of Newsweek, Sorkin jokes that there's a lot of pressure writing for an actor of Lowe's caliber. "You're looking at the spectre of [past Lowe films] Atomic Train and Oxford Blues and St. Elmo's Fire," he says, "and you try to live up to those standards, and sometimes you can't." Ouch! So far, Lowe's camp isn't commenting.