Rick Perry wants Mitt Romney to cough up his form 1040s (that’s the US individual tax return document). The Romney camp demurred, saying they would consider doing so next year. (Remarkably, Romney has NEVER released, even during his governorship of Massachusetts.) Why won’t Romney do it? Speculation, from liberal group ThinkProgress and others, is that Romney pays a way lower tax rate than many Americans because of his extensive financial investments, from which income is typically taxed below that of regular income. One left-leaning analyst speculates Romney paid an effective tax rate as low as 14 percent on his $6.6...