ECB President Draghi quashes talk of early exit from stimulus measures.

Move follows S&P downgrade; will last until mid-March.

Move follows S&P downgrade; will last until mid-March.

Fed leads effort to ease Europe's sovereign debt crisis.

Fed leads effort to ease Europe's sovereign debt crisis.

European Central Bank to coordinate with Fed on dollar liquidity operations.

European Central Bank to coordinate with Fed on dollar liquidity operations.

Exiting chief economist Stark opposed banks purchases of Italian, Spanish bonds