After experience in George H.W. Bush's administration and subsequent years in corporate public affairs, Thomas Collamore joined the US Chamber of Commerce in 2007 and now represents the world's largest business federation, overseeing the interests of more than 3 million businesses, state and local chambers, and industry bodies.
 
The Republican-leaning Chamber is by far the largest spender on lobbying activity, dwarfing the outlay of other bodies, such as PhRMA and the American Beverage Association, and corporate giants such ...