In the House of Representatives three decades ago, Newt Gingrich befriended the apostle of supply-side economics, Rep. Jack Kemp (R., N.Y.). Gingrich didn’t wed himself to the theory as Kemp did, but he used it as a tool to accomplish a larger goal: a Republican majority in the House.

In 1977, Kemp and Sen. William Roth (R., Del.) introduced a bill to cut income-tax rates by 30 percent across the board. A year later, Gingrich endorsed the proposal in his first successful bid for Congress.

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