WASHINGTON — Senator Clinton squared off yesterday with her possible challenger for the White House in 2012, General David Petraeus, and came closer than any of her colleagues to calling the commander of the multinational forces in Iraq a liar. Using blunter language than any other Democrat in the last two days, Mrs. Clinton told General Petraeus that his progress report on Iraq required "a willing suspension of disbelief." Referring to the charts General Petraeus brought to the House and Senate this week, Mrs. Clinton said, "Although the charts tell part of the story, I don't think they tell the...