Today on All Thing's Considered there was a pretty funny segment: an interview with two of the voices (literally) behind the ads. Click

"Melissa Blocks talks with voice-over artists Dennis Steele and Scott Sanders about how to make a threatening voice for a political ad."

Actually on that linked page, you may want to click the "Listen" button at the top and turn off your monitor: they also have a whole set of video clips of various ads, for those who can't get enough, I guess!

~ Becky in Tucson