GOP Sens. John Barrasso (WY) and Lamar Alexander (TN) are asking CMS Administrator Marilyn Tavenner to provide detailed information on the number of people currently enrolled in coverage through the health law's insurance exchanges. The administration has not released updated enrollment data since it announced 8 million had enrolled through the federal and state-based exchanges as of mid-April, and the senators note various events -- including the large numbers of inconsistencies on applications -- call that number into question. The...