Who do you think national politicians pay attention to?  Seriously.  

Do you believe that the US Chamber of Commerce is anything at all like your local Chamber of Commerce.  It's the largest pro business lobby in the nation and it's all about the big boys.  Don't let the name fool you.

I found this in a 15 second search, but I've read several supporting articles of the years.   It's the LARGEST lobbying group in the nation and has next to nothing to do with small business.    It's clearly not science based either.   It's a lobbying organization with a nice sounding name.