https://en.wikipedia.org/wiki/Presidency_of_Barack_Obama#Approval_ratings_and_other_opinions
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Obama's election also provoked a reaction to his race, birthplace, and religion. As president, Obama faced numerous taunts and racial innuendos, though most overt racist comments were limited to a small fringe.[454] Donald Trump theorized that Obama had been born in Kenya; an April 2011 CNN poll taken shortly before Obama released his long-form birth certificate found that 40% of Republicans believed that Obama had been born in Kenya.[443] Many of these "birthers" argued that because Obama was (allegedly) not a citizen, he was not eligible to serve as president under the natural-born-citizen requirements of the Constitution. Despite Obama's release of his long-form birth certificate, which affirmed that Obama was born in Hawaii, a 2015 CNN poll found that 20% of Americans believed that Obama was born outside of the country.[455] Many also claimed that Obama practiced Islam, and a 2015 CNN poll found that 29% of Americans and 43% of Republicans believed Obama to be a Muslim.[455] Even prior to his election as president, Obama had clarified that he was a long-time member of a church affiliated with the United Church of Christ, a mainline Protestant denomination.[456]
In a January 2010 survey by the Siena Research Institute at Siena College in Loudonville, New York—one year into the Obama presidency—238 U.S. history and political science professors ranked Obama 15th of 43 U.S. presidents.[457] In a September 2010 survey by the United States Presidency Centre of the Institute for the Study of the Americas at the University of London School of Advanced Study—one year and eight months into the Obama presidency—47 unnamed respondents who were UK academic specialists on American history and politics ranked 40 of 42 U.S. presidents from 1789 to 2009, not including Obama; if Obama had been included he would have ranked 8th, behind Harry S. Truman but ahead of Ronald Reagan and all other post-World War II U.S. presidents.[458][459][460] In a June 2012 survey by Newsweek magazine—three years and five months into the Obama presidency—ten selected American historians and biographers ranked Obama 10th of 20 U.S. presidents since 1900.[461][462] In an April 2013 survey by History News Network (HNN) website in Seattle—four years and three months into the Obama presidency—203 scholars from 69 top U.S. colleges and universities gave Obama a B- grade on an A–F scale.[463] A February 2015 Brookings Institution survey of members of the American Political Science Association put Obama in 18th place out of the 43 presidents.[464] Additionally, a 2011 Gallup poll found that 5% of Americans saw Obama as the country's greatest president.[465]
As Obama left office, historians expressed various opinions about his effectiveness as president, with many noting that subsequent events would determine his ultimate legacy.[466][467] There was universal agreement that Obama would long be remembered as the first African-American president.[466][467][468] Many noted that Obama presided over an economic recovery and passed major domestic legislation, but failed to bridge a partisan divide and left office with his party in a weakened state.[466]