After weeks of stalling, Mitt Romney did an about-face on Tuesday and said he will release his tax returns in April and that they will show he pays close to 15 percent of his income in taxes. Romney, a multimillionaire, has been under pressure from his rivals for the Republican presidential nomination and others to release the information. He'd previously said he wouldn't release it. He suggested Tuesday that he would make public only one year's worth of information, for 2011. Speaking to reporters after a campaign stop in South Carolina, Romney said most of his income comes from investments,...