If France goes socialist watch their economy tank. The wealthy are already leaving rather than face a 75% tax rate and France is already broke. I expect within a year after a socialist government take over in France the Euro will crumble.
Merkel has to be wetting her pants over this one. Germany is almost single handedly propping up the Euro. If France goes the way of Greece, Spain, Portugal, Italy, and Ireland, Germany will probably have no choice but to abandon the Euro to save itself.