By CNNMoney staff November 1, 2011: 6:28 AM ET Click the chart for more premarket data. NEW YORK (CNNMoney) -- U.S. stocks are set to tumble at the opening bell Tuesday, after Greece's prime minister called an unexpected public referendum to approve Europe's bailout deal. Investors fear the referendum will jeopardize the deal, since the bailouts include austerity cuts that have not been popular with Greek voters. Dow Jones industrial average (INDU), S&P 500 (SPX) and Nasdaq (COMP) futures...
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