That was tried in the 50s, and never got off the ground (or the drawing board) because of the ridiculous weight of the powerplant.
Plus, think of the contamination area when one crashed.
I know, but I bet much has changed with our knowledge of nuclear devices since 60 years ago. With Obama just presenting to the UN for a nuclear free world all that funding and some of the great nuclear minds could still be put to great use IMO. I am also a great fan of reintroducing the star wars program which if it succeeded could cut our defensive spending in half in future years. But I'm a radical with conflicting ideas I know that.
Edit:
Didn't he write term paper or something similar about the concept of Fedex and overnight delivery service while he was a student at Yale long ago, and it was only deemed barely worthy of a "C" grade since it was deemed unattainable or overly ambitious?
I refer you to my signature...Quotes by some of the most brilliant men alive should be studied by all IMO, this is just my favorite of thousands I have read through...