CRAWFORD, Texas — Pent-up fervor fueling both sides of the national debate over President Bush's Iraq policies erupted Saturday near his vacation home, with thousands of protesters venting frustrations and using parents of fallen soldiers as icons of their dueling movements. Both the president's supporters and critics endured 100degree temperatures to rally in separate locations miles apart, and several hundred engaged in an emotional standoff at the fork in a road on the fringe of the Bush property — singing, chanting and yelling epithets. ADVERTISEMENT Separated by at least nine sheriff's deputies and a traffic island guarded by authorities as...