Clearly Jon Hamm
isn't too concerned with upsetting powerful people, as evidenced by his latest appearance on "Late Show
" (Weeknights, 11:35 p.m. EST on CBS). When asked by David Letterman to explain what he could about the lengthy break between the fourth and fifths seasons of "Mad Men
," Hamm said, "I've described it thusly, and I got in trouble, so I'll do it again the same way."According to Hamm, "When billionaires fight it takes a lot ...