"He gave a beautiful speech in which he called for one America. Not a blue America or red America, but one America."
Yeah, he called for that. However, like most if not all of his flowery speeches, it turned out to be full of crap. Three years into his presidency, he has turned into easily one of the most intentionally divisive presidents in recent American history. In his speeches, he constantly, blatantly encourages hatred and division on racial, political, and social/ economic bases. He specifically called out people who raised/ donated money to the GOP and accused them of "Betting against America." He deliberately inflamed racial tensions with his remarks on the Trayvon Martin incident (As did Sharpton, of course). He regularly demonizes financially successful people as "Greedy fat cats."
The "One America" he desires is an America in which everyone who disagrees with him on any aspect of his Socialistic agenda is immediately silenced.