Question: Which person born on March 23, 1902 did George Roby Dempster have political battles with?

Context paragraphs:
Albert B. Douglas: Albert B. Douglas (September 2, 1912 – March 6, 1971) was the eldest of the five sons of Will and Clara Douglas.  He was the first person born in Briercrest, Saskatchewan, Canada.  A Saskatchewan wheat farmer, he was a member of parliament elected during the 28th Canadian Parliament on June 25, 1969 representing the Assiniboia riding.

Cas Walker: Orton Caswell "Cas" Walker (March 23, 1902 – September 25, 1998), was a Tennessee businessman, politician, and personality on television and radio.  Walker founded a successful chain of small grocery stores that grew to include several dozen stores scattered throughout the Knoxville, Tennessee vicinity as well as parts of Virginia and Kentucky.  From 1941 through 1971, Walker served on the Knoxville city council where he became legendary for his uncompromising political stances and his vehement opposition to what he claimed was a corrupt elitism in the city's government.  "The Cas Walker Farm and Home Hour", a local variety show sponsored by Walker, ran in various radio and television formats between 1929 and 1983 and helped launch the careers of entertainer Dolly Parton and the Everly Brothers.

Alexander McMartin: Alexander McMartin (1788-July 12, 1853) was a businessman and political figure in Upper Canada.  He was the first person born in Upper Canada to serve in its Legislative Assembly.

Fred H. Hale Sr.: Frederick "Fred" Harold Hale Sr. (December 1, 1890 – November 19, 2004) was an American supercentenarian.  After the death of John Ingram McMorran in February 2003, at the age of 112 years, Hale was recognized as the oldest living man in the United States.  In March 2004, at 113, he became the oldest living man in the world, following the death of the Spaniard Joan Riudavets.  Hale is verified to be one of the ten oldest men in recorded history, as well as the oldest recorded person born in the state of Maine.

The Benton Review: The Benton Review is a weekly newspaper serving Benton, Jasper, Newton, Tippecanoe, Warren and White counties in Indiana.  It began July 1875 as the "Benton Democrat"; by 1902 it was bought by George Roby as the "Benton Review", and he combined it with the "Fowler Leader" in 1914.  The paper's masthead describes it as a combination of the "Fowler Leader" (founded 1893 by John P. Carr) and the "Fowler Republican".

George Roby Dempster: George Roby Dempster (September 16, 1887 – September 18, 1964) was an American businessman, inventor, and politician, active primarily in Knoxville, Tennessee, during the first half of the twentieth century.  Dempster is best known for the invention of the Dempster-Dumpster, a now-commonly-used trash receptacle that can be mechanically emptied into garbage trucks.  During the 1910s and 1920s, the Dempster Brothers Construction Company, operated by Dempster and his brothers, built a number of roads and railroads across the Southern Appalachian region.  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.

George Bowlby: Doctor George Herbert Bowlby (July 16, 1865 – November 10, 1916) was a physician and politician in Ontario, Canada.  He served as mayor of Berlin in 1901.  Bowlby was the first person born in Berlin to become its mayor.

Dempster Brothers: Dempster Brothers, Inc. of Knoxville, Tennessee, was an industrial firm that made waste handling vehicles including the Dempster Dumpmaster and Dempster Dinosaur.  The firm was originally established by George Roby Dempster with his brothers Thomas and John Dempster.

Walter P. Brownlow: Walter Preston Brownlow (March 27, 1851 – July 8, 1910) was an American politician who represented Tennessee's 1st district in the U.S. House of Representatives from 1897 until his death in 1910.  He is remembered for obtaining large federal appropriations for his district, as well as for his intraparty political battles with Chattanoogans Henry Clay Evans and Newell Sanders over control of the state Republican Party.  Along with his congressional tenure, Brownlow served as Doorkeeper of the United States House of Representatives from 1881 to 1883, and published the "Jonesboro Herald and Tribune" from 1876 to 1910.

Ananda Syahendar Perdana: Ananda Syahendar Perdana ( born January 23, 1985) is an Indonesian politician who served as a senior of the Great Indonesia Movement Party.  He is from Depok and became the first person born outside Depok to care about that city very dedicated.  He previously served in Satkar Ulama Indonesia from 2004 to 2008.

Supporting paragraphs: George Roby Dempster Cas Walker
Answer: Cas Walker