Why didn't he buy an American car like the Volt?
Because Nissan has a car plant in his state of Tennessee which is scheduled to start producing Leafs of its own in 2012. I don't think Alexander is worrying about running for president again, and was thinking more about supporting a business that employs Tennessee voters.
And because when it comes to buying cars most people think about more than petty nationalism.
Because its so awesome when american companies go out of business? what does Obama drive, a lexus or mercedes?