She had worked hard to restore her political reputation, following her conviction for breaking election law on campaign expenses at the last election.

BBC: Jones loses to Conservative

The AP also found no apparent reimbursement to Melgen in more than six years' worth of campaign expenses on file with the Federal Election Commission.

WSJ: Menendez denies he was with Dominican prostitutes

Independent election watchdogs believe that candidates routinely under-report or hide campaign expenses.

BBC: Why India is in dire need of electoral reform