Government wiretaps of opposition politicians usually remain secret, restricted to the ears of spooks and ministers. But in democracy Venezuela-style, everyone gets to listen in.

President Hugo Chávez has filled the airwaves with tapped conversations of his political foes to embarrass and apparently intimidate them in the run-up to regional elections. State TV has broadcast the recordings, enhanced with comic sound effects, in a barrage of attack adverts that would make even Karl Rove blush.

The prime target has been Manuel Rosales, an opposition leader who is tipped to become mayor of Maracaibo, Venezuela's second city. One advert features him discussing buying expensive jewellery, along with sound and visual effects of rings and a Cartier watch.

Another advert plays a conversation with Rosales negotiating the purchase of cattle, to a backdrop of mooing sounds and cartoon pictures of coins.

Other politicians, as well as journalists and diplomats, have found private conversations, as well as photographs and video images, broadcast on state TV.