The Chicago Tribune is an American daily newspaper based in Chicago, Illinois, United States. Founded in 1847, it was formerly self-styled as the "World's Greatest Newspaper", a slogan from which its once integrated WGN radio and WGN television received their call letters. It is the most-read daily newspaper in the Chicago metropolitan area and the Great Lakes region, and the sixth-largest newspaper by print circulation in the United States. In the 1850s, under Joseph Medill, the Chicago Tribune became closely associated with the Illinois politician Abraham Lincoln, and the then new Republican Party's progressive wing. In the 20th century, under Medill's grandson 'Colonel' Robert R. McCormick, its reputation was that of a crusading newspaper with an outlook that promoted American conservatism and opposed the New Deal. Its reporting and commentary reached markets outside Chicago through family and corporate relationships at the New York Daily News and the Washington Times-Herald. Through much of the 20th century and into the early 21st, it employed a network of overseas news bureaus and foreign correspondents. In the 1960s, its corporate parent owner, Tribune Company began expanding into new markets buying additional daily papers. In 2008, for the first time in its history, its editorial page endorsed a Democrat, Barack Obama, a U.S. senator from Illinois, for U.S. president. Originally published solely as a broadsheet, the Tribune announced on January 13, 2009, that it would continue publishing as a broadsheet for home delivery, but would publish in tabloid format for newsstand, news box, and commuter station sales.