Now Come the Commercials

Now that the Nevada GOP presidential is almost a week away, we are now hearing the commercials.  Since all the advertisements are going for GOP candidates, watch for some liberal head explosions and a radio or two (they still make radios, don't they?) and possibly a TV or three might go out the window.
So far, I heard a pro-Gingrich, an anti-Romney and an anti-Gingrich advertisements, all run by PACs.  I am sure the radio, newspaper and TV stations are going to be happy because of the increased commercials.
I just wonder if the commercial make a difference?