Last night David Letterman ripped into septuagenarian presidential candidate John McCain. Letterman made a couple quips that could definitely offend the AARP community. He framed McCain as the stodgy old man that looks "like the old guy at the barber shop," "a Wallmart greater," "the guy who is always early for the 'Early Bird Special'," and "the guy at the supermarket who is confused by the automatic doors."Source