Question: Which person born on March 23, 1902 did George Roby Dempster have political battles with?
Sentence (from "George Roby Dempster"): Dempster also served as a city manager and mayor of Knoxville, where he became legendary for his political battles with eccentric Knoxville businessman Cas Walker and "Knoxville Journal" editor Guy Smith, Jr.
Relevant evidence: Yes