It turns out about a third of new electricity generated capacity came from wind turbines last year and we now have 47 GW of capacity (a large powerplant produces about 1 GW give or take and the residences of San Diego comsume about 1 GW) ... but this is still a relative drop in the bucket.
A few states are competitive at the world level - wind accounts of 22% of the electricity produced in South Dakota and 19% in Iowa. Unfortunately our power grid, largely built on technologies from six decades ago, can't handle more than about 20% of its power from intermittant sources like wind and solar. Iowa and South Dakota may become important laboratories for beginning to improve the grid.
Cheap natural gas and the questionablity of alternate energy incentives will slow and possibly halt progress for awhile - sad as there have been very strong incentives operating in the fossil fuel world for decades and the domestic wind industry has been a bright spot of US manufacturing. But such are economic and political realities.
Oh - and while you can't put a wind turbine on a car, you can't put an oil or natural gas well on one either (but, as has been pointed out, you can put a dog on the roof), but the fact that electric cars have batteries make them natural partners for intermittant sources like wind and solar....