Wall Street turned mixed Tuesday as investors awaited the Federal Reserve's interest rate decision and absorbed more fallout from the mortgage and credit crisis.

Investors are expecting policymakers to cut rates Tuesday afternoon for a third straight time, and perhaps indicate that more might be forthcoming. Most economists are expecting a quarter-point cut in the federal funds rate to 4.25 percent -- though there are some hoping for a half-point cut in the Fed's last meeting this year.

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Oil prices rose in anticipation of a rate cut, a move that could bolster energy demand from world's biggest oil consumer. Light, sweet crude for January delivery rose $1.73 to $89.59 a barrel on the New York Mercantile Exchange.

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What happens when we get to zero?