NEW YORK ( DailyFinance) -- Last weekend was a key test for Oprah Winfrey's latest media venture: Would the Oprah Winfrey Network -- OWN -- succeed as her earlier efforts have, or would her jump to cable flounder like Martha Stewart's move to the Hallmark Channel last year? More was on the line than Winfrey's reputation. The network had promised its initial advertising partners, including giants such as Procter & Gamble ( PG) and Kohl's ( KSS) department stores, that the network would deliver viewers. Many of OWN's initial advertisers had pledged between $10 million to $15 million in ad spending, with Procter & Gamble agreeing to buy more than $100 million in ad time over three years. The network has also demanded premium prices for its commercial time: OWN ranks as one of the country's most expensive cable networks, says Kathleen Kayse, executive vice president of advertising sales at OWN.
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