CARACAS, Venezuela (AP) - To the beat of drums and trilling whistles, thousands of activists from around the world showed their opposition to globalization and the Iraq war at the opening Tuesday of the World Social Forum backed by Venezuelan President Hugo Chavez. The six-day conference got under way in Caracas amid a light drizzle as activists paraded along wide avenues chanting "Socialism, yes! Imperialism, no!" About 80,000 people signed up to attend the forum, including tens of thousands from outside Venezuela, organizers said. Cindy Sheehan, an American peace activist whose son was killed in Iraq, addressed a sea of...