President Trump appeared to be pleased with the Democratic National Committee chair results on Saturday, tweeting a sarcastic congratulations to the victor, Tom Perez, and the Republican Party. Congratulations to Thomas Perez, who has just been named Chairman of the DNC. I could not be happier for him, or for the Republican Party!— Donald J. Trump (@realDonaldTrump) February 25, 2017 In response, Perez, the former Obama labor secretary, told Trump to wipe the grin off his face. He, his deputy chair Keith Ellison, and all Democrats are now a united front, he argued. Call me Tom. And don't get too happy. @keithellison...