Tony Campolo addressed parliamentarians in Westminster on Wednesday about the need to eradicate corruption.  The event was organised by Bible Society as part of the church-led Exposed campaign  encouraging people to sign a Global Call to End Corruption.  The campaign will culminate with a weeklong vigil from 14 to 20 October, with Christians around the world participating. Exposed campaigners are aiming to get a million signatures added to the petition, which will be presented to G20 leaders at a summit in November 2014.  Campolo demonstrated his support by adding his signature at Wednesday's event.