WASHINGTON — Sen. Hillary Rodham Clinton has touched off a diplomatic flap with Iraq's incoming government by questioning whether the leading candidate to become the next prime minister is too close to Iran's ayatollahs. The likely new prime minister, Ibrahim al-Jaafari, shot back at Clinton, who just completed a visit to Iraq, by questioning her credibility as a spokeswoman for U.S. foreign policy. "Hillary Clinton, as far as I know, does not represent any political decision or the American administration and I don't know why she said this," al-Jaafari told The Times of London. "She knows nothing about the Iraq...