Democratic presidential candidate Barack Obama’s big speech tonight will be delivered from an elaborate stage resembling a miniature Greek temple. The stage, similar to structures used for rock concerts, has been set up at the 50-yard-line, the midpoint of Invesco Field, the stadium where the Denver Broncos’ National Football League team plays.Some 80,000 supporters will see Obama rise up appear from between plywood columns painted off-white, reminiscent of a Holy Shrine Washington’s Capitol building or even the White House, to accept the party’s nomination for God president.