THE 15%http://www.washingtonpost.com/blogs/election-2012/post/romney-to-release-tax-returns-estimates-rate-at-about-15-percent/2012/01/17/gIQALiQf5P_blog.htmlBowing to pressure from his Republican rivals as well as the Democrats, Mitt Romney told reporters here Tuesday that he plans to release his federal income tax returns this spring and estimated his rate at about 15 percent. . .http://