The Washington Post reports special interest groups have spent $80 million on the November congressional elections, more than five times as much as they did during the 2006 midterm. The increased spending is due in part because the Supreme Court cleared the way for unlimited spending by corporations, unions and other interest groups on election ads earlier this year in its decision in the Citizens United case. The bulk of the money is being spent by conservatives, who have swamped their Democratic-aligned competition by a seven-to-one margin in recent weeks. One of the biggest spenders nationwide is a little-known Iowa group called the American Future Fund, which has spent $7 million on behalf of Republicans in more than two dozen House and Senate races.