$172 million

Amount of “dark money” politically involved groups that do not disclose their donors have spent, through July 26, on campaigns that include television, radio and Internet advertising, according to Huffington Post. Total spending by these groups is likely far greater, since they are required to report only a fraction of their spending to the FEC. Politically involved independent groups that publicly disclose their donors, including super PACs, have spent $174 million so far this election cycle.