A bipartisan group of Michigan lawmakers wants all sixth-grade girls to be vaccinated against cervical cancer. A Republican state senator who is the lead sponsor said it's the first legislation of its kind in the U.S. The vaccine was approved by federal regulators this summer and hailed as a breakthrough in cancer prevention. The shots prevent infections from strains of a sexually transmitted virus -- human papilloma virus, or HPV -- that can cause cervical cancer and genital warts. At the time, conservatives expressed concern that schools would require the vaccine for enrollment. They argue that such mandates infringe on...