I agree with whomever said that Michael Landes was too old looking to play Jimmy. Lois was 26 in the pilot, and theoretically turned 27 not long after (remember, she's a Libra) and Jimmy was supposed to be a news aide/intern type who would be in their early 20s.
Michael Landes would have only been 21 during the first season, but he looked older, and his wardrobe didn't help. I liked that Justin Whalin looked younger and a bit more casual, like a kid just starting out in newspapers wearing what he thought was appropriate office attire -- flannel shirts and jeans.
