Gallup, one of the country's most well-known polling firms, announced Wednesday that it will no longer track presidential approval or favorability of political figures. The move ends the longest-running continuous effort to track US opinion of the nation's president, dating back to the tenure of Franklin D. Roosevelt in the late 1930s. The company attributes the change to a shift toward research on "issues and conditions that shape people's lives." Gallup has some of the longest trend data in polling on public opinion about prominent issues and the nation's mood, which it plans to continue, and says that it will no longer "publish assessments of individual political figures." The end of presidential approval tracking at Gallup is the latest in a long line of shifts that have remade the landscape of polling over the last few decades.