NEW DELHI - Former Lok Sabha Speaker P A Sangma, who is considered an underdog in the presidential race, on Saturday pinned his hopes on "big number of hidden votes" and equated himself with the "black man" Barack Obama making it to the White House. "We have (the case of) Barack Obama...Nobody thought a black man would ever occupy White House. If a black man can become the President of America, why can't an adivasi become the President of India," the NCP leader