Several state-based exchanges have established open enrollment periods that differ slightly from the federal government's schedule, which CMS shortened to a six-week period starting last year, although five of the exchanges will stick with healthcare.gov' s Nov. 1 -- Dec. 15 time frame. While most states that opted for a different open enrollment period simply extended the deadline, enrollment in the nation's largest exchange, Covered California, will start early -- on Oct. 15 instead of Nov. 1 -- and run...