UPDATE 1-Obamacare enrollment to surpass 7.5 million -U.S. official By: Reuters: Company News April 10, 2014 at 14:58 PM EDT (Adds details throughout, Medicaid backlog numbers and fresh quotes from Sebelius and Menendez) Read More >> Related Stocks: Aetna Cigna Corp Humana Molina Healthcare Inc UnitedHealth Group