As Chicago prepares to host the Democratic National Convention, local business owners are divided as to how it will impact the city and their bottom line.Chicago will soon be in the national spotlight when it hosts the DNC on August 19-22, with an anticipated 50,000 visitors attending the event. Street and walkway upgrades are already underway, and according to a law enforcement source, the plan is to isolate the convention area from the rest of the city entirely, with access only for the media, law enforcement and DNC designees. Authorities are imposing strict measures on people who live and work inside