Artur Davis: Enter the last dream date that Republicans may have at their disposal. His name is Jeb Bush, and this time, there is a feasibility around the idea that seemed unthinkable months ago. ... Jeb Bush should measure his reluctance against the risks looming for his party and, potentially, his country. The fact is that his party could be staring at an unavoidable disaster unless, in the interests of saving it, its best candidate comes out of retirement.
