As Oprah wraps up her daily talk show Wednesday, it's tough to overstate the cultural force known as the Oprah Effect, permeating everything from the TV business to books and magazines to charity to outright promotion of commercial products.

May 13

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Jim Lehrer announced this week that he's stepping back from daily anchor and co-anchor duties on the PBS NewsHour - so we decided to take a look back at some highlights from his 52 years in journalism and his…