Perhaps We Won't Get to General Elections

Some of my survivalist friends are getting rather concerned about this:

Asteroid with ‘uncertain’ trajectory to graze earth on Mar. 7 — ‘It’s going to be close, real close’

Scientist predict trajectory from between 19,000 miles and 10 million miles with uncertainty

There is a lot of news coverage of this, all pretty confident that this might be a near miss or perhaps a far one.  Still, a 30 meter rock is pretty serious.  I am sure if there was any realistic possibility of a hit, Obama would be invoking emergency measures to disarm everyone to discourage idiots trying to shoot it down.  A 10 meter asteroid is Hiroshima sized energy release.  Something 30 meters is 27 times the mass (volume and mass go up with third power of diameter), so about .5 megaton.