(Reuters) - Canada's main stock index looked set to open lower on Tuesday, tracking global markets, as lingering concern about a possible U.S. fiscal crisis and delays to an installment of Greek aid dampened investors sentiment. TOP STORIES Amid a global fright over Washington's political brinkmanship, U.S. lawmakers return to the capital on Tuesday with a seven-week deadline to reach agreement on scheduled tax hikes and budget cuts that threaten to trigger another recession. ...
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