Vocal problems have forced Jordin Sparks to temporarily withdraw from Alicia Keys' tour and cancel all performances for the rest of the month, a representative for the "American Idol" champ said Monday. The New York Post is reporting that Sparks' injury could be career-threatening. According to the paper's Web site, Sparks is suffering from "an acute vocal cord hemorrhage." Contrary to the New York Post report, Washington said Sparks ...