"Mass Venezuela opposition rally
By Greg Morsbach
BBC News, Caracas
Mr Rosales will face President Hugo Chavez in December's presidential poll.
The march, which filled the main avenues of the city centre, was the biggest opposition rally Venezuela has seen since early 2004.
Then, protesters made an unsuccessful bid to oust Mr Chavez from power in a recall referendum."........
........"Mr Rosales condemned what he called the cheque book diplomacy of Mr Chavez, accusing him of giving away Venezuela's oil wealth to foreign powers."......