Celebrity support, always important in national campaigns, is likely to play an increasing role in the high-cost, heated presidential campaign of 2008.

When it comes to good-looking supporters, Barack Obama leads the pack, with Scarlett Johansson, Jennifer Aniston, Halle Berry, Jamie Foxx, and George Clooney. And of course, there’s his powerhouse stumper, Oprah Winfrey.

Hillary Clinton is backed by a slightly older, more established, show business crowd which includes Chevy Chase, Danny DeVito, Rob Reiner and Steven Spielberg.

The radio business has been very good to Lowry Mays and Billie Joe “Red” McCombs.

In 1972, they formed the San Antonio Broadcasting Company to buy an FM station for $125,000.

Thirty-five years later, that company is called Clear Channel Communications and it owns more than 1,000 stations. Its shareholders recently approved a $19.5 billion private equity buyout that values Mays’ stock at more than $1.1 billion and McCombs’ shares at about $190 million. The deal is expected to close before the end of the year.

In early 2000, when Clear Channel shares hit $95, the founders’ stock would have been valued at more than twice as much as now.