Corporations , individuals , special interest groups can sell campaign advertising anonymously . Sen. Claire McCaskill , a Democrat , says special interests seek to buy votes by funding campaign ads . Republicans opposed bill to force disclosure of donors ' names and amounts , she writes . The rule of thumb is , McCaskill says , if you do n't find out who 's paying for the ad , do n't believe it .
Corporations , unions , special interest groups can fund campaign advertising anonymously . Sen. Claire McCaskill , a Democrat , says special interests seek to buy votes by funding attack ads . Republicans opposed bill to force disclosure of donors ' names and amounts , she writes . The rule of thumb is , McCaskill says , if you ca n't find out who 's paying for the ad , do n't believe it .