FILE - In this Aug. 30, 2013 file photo, Americans for Prosperity Foundation Chairman David Koch speaks in Orlando, Fla. Democratic Senate candidates are gambling they can turn voters against two obscure billionaire brothers who are funding attacks on them and the president?s health care law. Democrats are denouncing Charles and David Koch two of world?s richest people. The pair?s political network is spending millions on TV ads hitting Democrats in North Carolina and several other states. Senate Majority Leader Harry Reid says the Kochs are paying huge sums to try to ?buy? elections and advance a self-serving agenda of low taxes and less regulation. (AP Photo/Phelan M. Ebenhack, File)