Marc Edwards could not be more appalled as he watches President Bush push ahead with plans for war. If the United States invades Iraq, a disproportionate number of blacks will be among the troops, said the 45-year-old Harlem resident. Other minorities will be the war's victims, he said, adding that black families will be especially hard hit by its costs. "It's a war that's threatening to send this economy reeling and that's going to really hurt black people," Edwards, a bookstore marketing supervisor, said while standing on 125th Street. As Bush and his Cabinet continue trying to line up support...