The violence against Muslims, Blacks, Hispanics, and even the alt right didn't happen until Trump's rhetoric stirred up hatred and bigotry, dividing our country and bringing violence to the forefront.

The only thing divisive about Obama was the objections of right-wing bigots to the color of his skin, and the GOP's pledge to obstruct everything Obama as part of its planned power grab. 

It worked well for the 2010 and 2016 elections, and look how great things are going. Violence, bigotry, no achievements despite the GOP in complete power -- yep, great leadership.