Sen. Barack Obama (D-Ill.) (Joe Amon, The Denver Post)The crowd enveloping Barack Obama when he accepts the Democratic nomination for president at Invesco Field at Mile High will be asked to get to work for the privilege of witnessing the historic event live. In a half-hour interview Wednesday with The Denver Post, Obama's deputy campaign manager, Steve Hildebrand, said he wants to use the ticketing process as a massive recruitment tool meant to bring in supporters from all 50 states and energize them to carry the campaign into the final 60 days of the general election. "We're going to ask...