As I wrote in a previous The Week article, the Rubio plan has some great elements, including middle-class tax relief and sweeping corporate tax reform. There is also merit in lowering the top tax rate somewhat to signal that conservatives will not accept its continual ascent to pre-Reagan levels. And while Rubio's plan loses too much money, and taking investment tax rates all the way to zero would seem a political bridge too far, these are fixable issues, and something like the Rubio plan might pass some future Congress.
Critically, the Rubio proposal recognizes that while the U.S. needs faster economic growth, acceleration alone might not help many middle-class families in an economy buffeted by automation of middle-skill jobs and globalization. In short, it's an attempted response to real-world problems and conditions, not ideological litmus tests. His competitors might want to try the same strategy and reject the economic nostalgia and wishful thinking that's infected much of today's GOP policy debate.