CHICAGO — A man was stabbed and beaten outside a CTA station in the South Loop Friday evening in what appears to be at least the fourth similar attack in less than a week, police said. A witness called police around 6:12 p.m. to report the stabbing in the 1100 block of South State Street, the Chicago Police Department said in a media notification Friday night. Video surveillance showed a 30-year-old man was on the mezzanine level of the train station when he became involved in a fight with five men, police said. The fight moved to the street, where the five men punched and kicked the man while…