Casino tycoon Sheldon Adelson, DeVos family, Exxon Mobil and Microsoft among numerous donors
Despite the number of candidates involved, nearly 20 percent of the ads in the GOP primary have been negative ads targeting Donald Trump.
Sometimes, money isn't everything. Bernie Sanders needed an upset victory in New York City, and he was willing to spend his way to try to get it.
Tea Party groups have won a major victory, strengthening provisions established by the Citizens United case.
Online retailer to teenage super PAC founder: Not so fast