Mitt Romney has been criticized for not speaking out more forcefully on the debt-ceiling negotiations. But Mitt Romney, the Republican front-runner, has taken a subtler tack, avoiding the issue of the debt ceiling as he presses a more general assault on President Barack Obama's economic record. That has attracted the attention of his GOP challengers, who have begun to accuse him of ducking the most vital issue of the campaign so far. "The current debate is about what kind of leadership you're going to show," former Pennsylvania Sen. Rick Santorum said in an interview Monday. "If you're running for president,...