“The Daily Show” host Jon Stewart marveled at the one-week turnaround for Democrats as he celebrated the energetic arrival of Vice President Kamala Harris into the presidential race. The overjoyed Stewart did his best Monday night to sing “I’m Coming Out” by Diana Ross, then used his typical cutting humor to jab media outlets, lawmakers and pundits who said President Joe Biden couldn’t be replaced on the ticket to face former President Donald Trump. After playing a montage of several prominent figures — including MSNBC host Joy Reid and Rep. Robert Garcia of California — insisting the vote wou…