Rep. Jack Kemp at the Republican National Convention in Detroit in 1980. Photo: Getty Images

Jack Kemp never became president, but the country desperately needs a leader like him now. When Kemp died in 2009, two themes dominated tributes to his career as a star quarterback, congressman, cabinet secretary and candidate for vice president and president. Conservatives called him one of the most influential politicians of the 20th century who never made it to the White House. He was “among the most important Congressmen in U.S. history,” as a Wall Street Journal editorial put it. Liberals declared that the Republican Party needed, but didn’t have, a Kemp: a leader who cared about the poor, who wanted to make the GOP attractive to minorities and working-class voters, who never went negative and regularly worked across party lines.

Both evaluations were accurate. And both are relevant as the GOP struggles to find its 2016 presidential candidate. Republican voters—Democrats and independents, too—are looking for someone who, instead of raging at the status quo, will shake up Washington, make the economy grow again and restore hope in America’s future. A candidate working from the Kemp model could do all of that.

Kemp was a pivotal political leader because, as the foremost exponent of supply-side economics, he persuaded his party and later Ronald Reagan to adopt his tax-cut plan, known as “Kemp-Roth.” The top tax rate on individual income dropped in 1981 to 50% from 70%. Then Kemp helped pioneer tax reform, and the top rate fell in 1986 to 28%. Middle-income taxpayers enjoyed similar cuts.

After an era of “stagflation” and malaise in the 1970s, Reaganomics produced more than two decades of prosperity, restored American morale, undermined the Soviet empire and converted much of the world, for a time at least, to democratic capitalism. Kemp deserves a significant amount of credit.