Dr. Dobson has not made a plea for people to contact the FCC on this issue. In fact, just the opposite is the case. In addition to the story linked below from Family News in Focus, Focus on the Family has responded specifically to the "plea from Dr. Dobson" email.
Focus on the Family debunks the Dr. Dobson/RM-2493 Petition Rumor
There was a petition known as RM-2493. Filed by Jeremy Lansman and Lorenzo Milam in December 1974, this petition tried to limit religious groups from using TV or radio channels reserved for public or educational broadcasting. This petition was promptly denied.
The following web sites include other proof and information concerning about this rumor and O'Hair. If you know someone who does not know the facts about this petition rumor, please share this page with them. Help spread the word that this petition rumor is just that--a rumor.
Family News in Focus
About.com Urban Legends
Truth or Fiction
The O'Hair e-mail is not the only illegitimate e-mail being circulated; There are many others. If it seems unbelievable, it just may be a hoax. To find out, visit these sites:
Actually, I usually find the quickest way to debunk a rumor or a virus scare is by using a favorite search engine, such as Google. Just type in a few keywords, or a file name or title in the case of a virus hoax, and most often you can quickly find a page debunking whatever hoax is being propagated.