CAIR? Center for American Islamic relations?
Those are the same Group, bro. But, there is a powerful Arab Lobby in the U.S. http://www.thedailybeast.com/articles/2010/08/24/the-arab-lobby-in-america-alan-dershowitz.html (here's a good article on it. I wouldn't go as far to say it's more powerful then the Israeli lobby (because it's clearly not...), but the Arab lobby most certainly is a thing.
As I stated the Saudi Lobby is pretty dang powerful, and it's a large chunk of the Arab Lobbying force. And that's the key to understanding the Arab Lobby. Arab-Americans don't really have a strong lobby (they have the Arab American Institute, AAI, but it's not even close to being super big) but Arab countries do.
Saudi Arabia, Kuwait, Qatar being the three players that are around the most.
Ah, yes. I know. Perhaps i could have used the punctuation better.