Elections in France and Greece this weekend could add more political instability to an already tanking Europe that has been dragging down bank stocks like JPMorgan Chase (JPM). The financial giant's shares were downgraded Friday at CLSA, which cited economic uncertainty in the U.S. as well as political and economic uncertainty in Europe. The price target was left unchanged at $43. Last month, CLSA downgraded Bank of America (BAC) shares too. In