The Tea Party is back — for President Donald J. Trump. A decade after the anti-government, anti-tax, and anti-Obama insurgency emerged, and eight years after the movement fueled the midterm elections that gave the Republican Party control of the House of Representatives and sent conservatives like Rand Paul, Michele Bachmann, and Mark Meadows to Congress, Tea Party activists are getting active again in midterm races. This time they’re not trying to blow up the system or fight big government. They’re here to support President Trump, no matter that he’s the biggest big-government Republican of them all. And in 2018, they’re...