Sigh. It is illegal for Google, like any other company, U.S. or foreign, to donate even $0.01 to any "congressional representative" (by that I take it you mean candidate for federal office or a current federal office-holder).
Google has never done so, and nobody, except you, has ever accused the company of doing so. Not only is this a slur, is the FUD equivalent of chemtrails, and it has no place on HN.
Source: "The law also prohibits contributions from corporations and labor unions. This prohibition applies to any incorporated organization, profit or nonprofit." http://www.fec.gov/pages/brochures/citizens.shtml#prohibited