Former President Barack Obama, who doesn't often comment on current politics, seemed to endorse on Saturday an op-ed written by 148 African Americans who served in his administration that called out President Donald Trump for recent comments degrading four congresswomen of color."I've always been proud of what this team accomplished during my administration. But more than what we did, I'm proud of how they're continuing to fight for an America that's better," Obama tweeted with a link to the op-ed published Friday evening in The Washington Post.Under the headline, "We are African Americans, we are patriots, and we refuse to...