Bad, bad idea. That would alienate the very troops we'd be hoping we'd defect to us. It would be better to do just the opposite. Not too many liberals join an all volunteer military. On the contrary, many of the military were gun owners in civilian life, and/or have fathers/uncles/brothers/sons who are gun owners. Sympathy for the RKBA probably runs stronger in the military than most other segments of society. So if we stricly avoid harming military dependents, we can probably count on both shared views and family ties to get a large number of them to join the revolt -- bringing their heavy weapons with them, of course.
Civilian politicians, on the other hand, are another topic entirely. Arguably the greatest threat is that any politician who casts his vote in favor of killing hundreds of thousands of citizens, knows that he'll have to spend the rest of his life in a bubble of bulletproof glass (imagine the Popemobile, only 24/7). Most people like to walk outdoors once in a while; the perpetual threat of snipers would make the guilty politicians prisoners.
Pray to God it never comes to that.
Assassins usually come from an inner circle where no bulletproof glass would protect them.
Very good point.