Today the California solar company Solyndra declared bankruptcy. Just about a year ago Solyndra was an example of President Obama's hope for the future: clean energy in a new technology that was putting people back to work. The federal government gave Solyndra half a billion dollars in loan guarantees. Now, with the company failing, solar's once sunny future might be looking dim. Here to explain more is Ken Zweibel, director of the Solar Institute at George Washington University.