Let's try that link again...
http://chicagotribune.com/technology/chi-0505310158may31,1,5465703.story
"Draft rules from the Federal Election Commission, which enforces campaign finance laws, would require that paid political advertisements on the Internet declare who funded the ad, as television spots do. Similar disclaimers would be placed on political Web sites, as well as on e-mails sent to people on purchased lists containing more than 500 addresses."