An overflow Portland audience for the former vice president's global warming talk results in a second show With a message about the urgent need to combat global warming, former Vice President Al Gore drew unexpected thousands of Portlanders to the Oregon Convention Center on Tuesday night. The crowds snaked around the corridors of the convention center, and those who were denied entry chanted and pounded on the doors until Gore agreed to do a second show. The Democratic presidential candidate in 2000, who lost one of the nation's most controversial elections, has among other pursuits been busily touring the country...