BlackBerry shares slide on Goldman downgrade

TORONTO (Reuters) - BlackBerry stock fell nearly 4 percent on Monday after Goldman Sachs cut its rating, citing a disappointing U.S. launch for the smartphone maker's new touchscreen device that went on sale in the United States on Friday. "Our retail checks at over 20 store locations since March 22, including at AT&T, Best Buy, and RadioShack, revealed a surprising lack of marketing support and poor positioning of the product," Goldman Sachs analyst Simona Jankowski said in a note to clients on Monday. Jankowski also said advertising of the product launch was limited. ...

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