Chris Szagola/AP images, Julien de Rosa/AP images, Tyler Le/BIJoe Biden got his wish to hold the earliest major presidential debate ever.Even the president's allies admit the debate is unlikely to dramatically alter the race.But Biden needs his debate against Trump to shake things up and quiet his skeptics.President Joe Biden needs his debate gamble to pay off.Biden, who's viewed his life as one shaped by fate, decided to upend his reelection campaign by scheduling the earliest major presidential debate ever.