 Donald Trump's choice of J.D. Vance as his running mate suggests he is leaning harder into the economic policy instincts that helped land his first term in 2016, and that he no longer feels the need to placate the type of free market conservatism that's dominated the party for decades. The former president's views on tariffs, spending, and immigration were no doubt a key ingredient to his electoral success, but he chose Mike Pence, a candidate with more traditional conservative free market viewpoints. Now the center of gravity has shifted, and Republicans in Congress will fill the pool if Trump wins in November.