Now the two most prominent electric cars each rule a continent -- Chevrolet Volt in the U.S. and Nissan Leaf in Europe.The all-electric Nissan LEAF just beat out 41 also-rans to be named 2011 European Car of the Year. The award comes in the same month that Volt won Motor Trend's and Automobile magazine's Car of the Year Award.The "Nissan LEAF" was hailed as a breakthrough for electric cars and