Six congressional races swamped by outside spending

  • The airwaves this year have been flooded with political ads from third party groups, thanks to a set of 2010 Supreme Court rulings including the Citizens United decision, which ushered in a new era of unlimited political spending in America.

    While most of the spotlight this year is on the presidential election, outside groups have the potential to make a bigger impact in congressional races, where a six-figure ad buy -- and especially a seven-figure investment -- can go a long way.

    The nonpartisan, nonprofit Center for Responsive Politics tracks outside spending in congressional races. Based on their data, here's a look at three House races and three Senate races where outside groups are spending the most to influence the outcome.

    NEXT: Ohio 16: Betty Sutton vs. Jim Renacci