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this morning on "world news now," taking aim, isaac is on the move in the gulf of mexico. and growing stronger. >> the monster storm is posing a major threat to new orleans on the eve of the anniversary of katrina. it's tuesday, august 28th. >> announcer: from abc news, this is "world news now." good morning, i'm john muller in for rob nelson. >> welcome back to the show. great to have you. i'm paula faris. the coming hours are crucial. and we'll get the latest on isaac's track live from accu-weather. also this half-hour, republicans are riding out the storm in tampa. we learn the star of the show, mitt romney, heading to the convention a little earlier than planned. they're condensing four days into three. speaker of the house john boehner telling diane sawyer last night, maybe we should just