A Mercer County man who authorities say robbed two 7-Eleven stores in Evesham minutes apart last month and later tried to rob one of the convenience stores again weeks later has been arrested. Bobbyjean Orak, 29, is charged with robbery, criminal attempt robbery and two counts of theft, Evesham police said Tuesday. Orak made threats when he robbed stores on East Main Street and Green Tree Road minutes apart on July 31, stealing cash at both locations, police said. He tried to rob the East Main Street store again on Aug. 13 but fled before employees handed over any money. Okam, of Hamilton, was…