A weekend rally for Democratic presidential hopeful Barack Obama was supposed to leave a hopeful tone in Longview, Texas. Instead, it left a sour note as vandals spray-painted racial slurs outside the campaign headquarters. "I don't even know why anyone would do this except ignorance you know, total ignorance, " said installation technician Lonzell Johnson. It was a sight that "Towles Phone Center" technicians never wanted to see. The phrase "a racist" was spray painted on the hood and the sides of two of their company vans. "I saw it, It hurt my feelings. You know what I'm saying? Off...