Is there a Muslim lobby?

From IslamOnline.net

When John Mearsheimer of the University of Chicago and Stephen Walt of Harvard published a report highlighting the efficacy of the Israeli lobby in molding US domestic and foreign policy, charges of malpractice and academic dishonesty were leveled at the authors.

Their paper, "The Israeli Lobby and US Foreign Policy," cited the organizational prowess of pro-Israel groups in marrying the media, think tanks, and numerous politicians into a unified front that muzzles criticism of the Jewish State.

However, in the vitriol exchanged by supporters and detractors of the paper, an illuminating section is overlooked.

Mearsheimer and Walt, in comparing the existence of the Israeli lobby to the likelihood of the existence of a similar Muslim or Arab grouping, say "pro-Arab interest groups, in so far as they exist at all, are weak, which makes the Israeli lobby's task even easier.