Is money the best medicine? We don’t know, but we know who to ask.

We took a look at the top recipients of campaign contributions from Pfizer, one of the most powerful pharmaceutical companies in the world, and found some of the most influential policy-makers in Congress, especially in the Republican leadership. Topping the list was House Speaker John Boehner, followed by Congressmen Fred Upton, James Clyburn, Ed Whitfield, and Kevin McCarthy.

It's clear that powerful industries in America, such as pharmaceuticals, exert significant influence over Congress. But what about the 2016 presidential hopefuls? Who gives Clinton money? What about Walker? How does Martin O'Malley compare to Jeb Bush? Get all the information you need in our exclusive guide to the 2016 presidential elections.

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