What would Greek exit mean for the U.S. economy?

WASHINGTON (Reuters) - Uncertainty over the fate of the euro currency is already dampening U.S. economic growth and any significant worsening of the crisis would deal a blow to a recovery that is gradually gathering steam.

Economists estimate that volatile markets and business uncertainty over the fate of Greece and the policy course in Europe is already shaving anywhere from one tenth to one half a percentage point from U.S. 2012 gross domestic product growth.