The notion of Kennedy as supply-side forerunner is a powerful myth, but it is a myth. Context is key. Conservatives love to quote a speech Kennedy gave at the Economic Club of New York in December 1962. Here's one quote—I've italicized the crucial part often left out: "Our present tax system, developed as it was, in good part, during World War II to restrain growth, exerts too heavy a drag on growth in peace time; that it siphons out of the private economy too large a share of personal and business purchasing power; that it reduces the financial incentives for personal effort, investment, and risk-taking." JFK was not expounding an implacable economic philosophy; he was speaking about a very specific circumstance. The top marginal tax rate was 91 percent, which JFK wanted reduced to a "more sensible" 65 percent. Compare that with today's 35 percent top rate, and ask: If supply-siders are so enamored of JFK's tax policies, would they advocate a return to a "more sensible" 65 percent top rate? Applying Kennedy's tax talk to the current structure, JFK biographer Robert Dallek says, is like comparing "apples and watermelons."
Another important piece of context is the thinking behind the tax cuts. Kennedy's economic policies were rooted in a Keynesian belief in the stimulative effects of budget deficits. While FDR and his aides had embraced countercyclical deficits as necessary in times of recession or depression, Kennedy was the first to advocate planned deficits in a time of neither war nor economic emergency. The aim was for the tax cuts to stimulate demand, driving the economy from the bottom up.
Republicans, by contrast, argued that while tax cuts were desirable, running an $11 billion deficit, "with no hope of a balanced budget for the foreseeable future, is both morally and fiscally wrong." That balanced-budget fixation was the ruling GOP philosophy until the rise of supply-side economics, which saw tax cuts as a way to boost investment (the supply side versus the Keynesian demand side) by helping the wealthy and business. Deficits were handled with the magical declaration that tax cuts pay for themselves.
It's a notion that the new House GOP majority has taken to bizarre and irresponsible extremes, eliminating "pay-go" rules mandating that new tax cuts or new spending be offset by tax increases or spending cuts. Instead the House now has "cut-go" rules, which require only that new spending be offset with spending cuts—tax cuts need not be offset and tax increases don't count as offsets. This from the party that oversaw deficit explosions in the Reagan and George W. Bush years, then claimed the mantle of fiscal responsibility in last year's elections. At least JFK and his partisan descendants are intellectually honest about deficits.
And the debate about JFK and tax cuts speaks to a broader misconception in our politics, that Republicans always want to cut taxes, while Democrats don't. Although it's true that tax cuts have become the alpha and omega of GOP economic policy, an astonishing number of conservatives actually advocate tax increases for lower-income Americans because those who don't make enough to pay federal income taxes lack "skin in the game" to really understand big government's villainy. Seriously.
But if ever advocating a tax cut makes someone a supply-sider, then JFK joins the ranks of other conservative economists like Bill Clinton and Barack Obama (the tax cuts in the stimulus package, for example, were arguably the largest in history). The key distinction is that JFK and his successors saw tax cuts as one of many available economic tools. Indeed Kennedy, like Obama, favored both tax cuts and spending increases to stimulate the economy. He moved first on tax cuts because he didn't think increased spending was initially politically viable, but it remained a large part of his agenda for 1964. "First we'll have your tax cut," he told chief economic adviser Walter Heller, 11 days before his assassination, "then we'll have my expenditures program."
Kennedy's economic philosophy was less about means—tax cuts versus spending increases—than ends. As he put it in his first address as president: "If a free society cannot help the many who are poor, it cannot save the few who are rich."