I. Abraham Lincoln is best remembered, of course, for winning the Civil War. That epic event, however, has obscured another enduring success of our greatest president — the first progressive income tax to help finance public works essential to a growing economy. So it’s odd that the self-proclaimed Party of Lincoln is now run by two billionaires who always overstate the costs of federal action while ignoring its benefits hoping that enough voters will credulously swallow their slogans about the “Deep State.” But America’s regulated economy and social safety net didn’t just materialize after an invasion of socialists from Mars....