President Obama’s job approval rating has plunged nine points since April to 41 percent, according to a new poll from McClatchy/Marist — his worst mark since hitting 39 percent in September 2011.

Mr. Obama, though, still enjoys a higher approval rating than lawmakers at the other end of of Pennsylvania Avenue. Twenty-two percent approve of Congressional Republicans and one-third of registered voters approve of Congressional Democrats’ job performance.

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Mr. Obama is slated to kick off a series of speeches on the economy Wednesday; 37 percent of respondents approve of his handling of the economy, while 56 percent disapprove.

Mr. Obama’s disapproval rating is at 48 percent in the poll, up slightly from April’s 46 percent.

“Clearly six months into his second term there’s been falloff across the board. It’s not like one group bailed on him,” said Lee Miringoff, director of the Marist Institute for Public Opinion at Marist College in New York. “When [Obama] gets away from talking about the economy, numbers have a tendency to slide.”

A Real Clear Politics average of polls from June 28 to July 21 puts Mr. Obama’s approval rating at 45.6 percent and his disapproval rating at 49.2 percent. On Christmas Eve last year, he was safely above water; he had an average 53.8 percent approval rating and 41.8 percent disapproval average.