Voting began in Venezuela to elect a new assembly with powers to rewrite the constitution. The opposition is boycotting the vote saying it is a power grab by President Nicol's Maduro.The government says the constituent assembly is the only way to bring peace back to the country after months of violent protests.<br/><br/>On the eve of the vote, protesters blocked roads in the capital Caracas in defiance of a ban on demonstrations. In a speech broadcast on TV, President Maduro predicted a big victory, calling the vote the most important election held in Venezuela's political system.