(context: In response, millions of people spurred on by groups as diverse as the National Rifle Assn. and the National Organization for Women contacted the FCC and Congress to voice their opposition. )
What does "as diverse as the National Rifle Assn. and the National Organization for Women" mean? I know the National Rifle Assn. and the National Organization for Women are two organizations. But why are they "diverse"?
Does that mean the two organizations are different from each other or the difference within each organization is quite big?