From media matters:
http://mediamatters.org/research/201009030023
The latest NEWSWEEK Poll tells a disturbing story. Obama's approval rating is 47 percent, slightly better than in the spring and not terrible for a president facing disturbing economic news. (Ronald Reagan touched bottom with 41 percent approval during the 1982-83 recession.) The problem is that some of the lies about Obama are gathering strength. In 2008, 13 percent of Americans were under the misimpression that he was a Muslim. Now the figure is 24 percent. One explanation may be that Obama's connection to his Chicago church was fresher in the public mind then. But the deeper problem is a growing number of people who think the president is not just disappointing or wrongheaded but dangerous. More than half of Republicans surveyed (52 percent) think it's "definitely true" or "probably true" that Obama "sympathizes with the goals of fundamentalists who want to impose Islamic law around the world." This says more about the mindset of the GOP than about Obama. It reflects not just the usual personal and partisan animus of the age (George W. Bush was subjected to exceptionally nasty attacks from the left) but a flight from facts--a startling disconnect between a quarter of the country and what some of Bush's aides once disparagingly called "the reality-based community."
The blame for this extends from Fox News and the Republican leadership, to the peculiar psychology of resentment in public opinion, to the ham-handed political response of the Obama White House. Whatever the cause, if smash-mouth tactics are validated by huge GOP gains in the midterm elections, then Big Lie politics may be with us for good.
In some ways, it has always been with us, going back to the 18th-century calumny of James Callender against John Adams, Thomas Jefferson, and Alexander Hamilton. More recently, the Rev. Jerry Falwell sponsored a film that falsely accused President Clinton of ordering murders and dealing drugs. What's changed about politics as a contact sport is the reach of the lies. With the exception of Father Charles Coughlin, the anti-Semitic "radio priest" of the 1930s, reactionaries haven't generally had big audiences. But now the cranks who once could do little more than write ranting letters to the editor on the red ribbons of their typewriters (loaded with exclamation points and in all caps, of course) can spread their venom virally, with the help of right-wing billionaires underwriting their organizations. And while the cable network they watch, Fox News, might not actively promote the idea that the president is a foreign-born Muslim, it does little to knock it down. Fox often covers Obama's place of birth and religion more as matters of opinion than of fact.