Secretary of State Condoleezza Rice has become the most popular member of the Bush administration and a potential candidate to succeed her boss in the White House, even as Americans lose confidence in the president she serves and patience with the Iraq war she helped launch. Entering her second year as the country's senior diplomat and foreign policy spokeswoman, Rice has improbably shed much of her image as the hawkish "warrior princess" at President Bush's side. The nickname was reportedly bestowed by her staff at the White House National Security Council, where Rice was an intimate member of Bush's first-term...