In the first place this is unnecessary. By following the law the same outcome could be dealt to the guilty. Basically, if an American commits a capital crime he is indicted and tried for the crime whether or not he shows up for Court. If a jury finds this defendant guilty and the Court condemns the defendant to death then there are a number of ways to complete this sentence. However the most economical is the bounty hunter. The bounty hunter would be paid a fee after killing the guilty and this would be totally legal. So a filthy un-American act like assassination need never be tolerated in the so-called land of the brave. Only in the land of the sniveling cowards would such unlawful behavior be acceptable.
Beside the above fact, if Americans allow any individual the power to murder another American only because that powerful individual says it's just then none of us are safe in the long run. This is the very power that King George and other royalty held over the people for which our forefathers fought a revolution. Then a nut like Hitler also possessed these powers and you see where that got 6 million people for the crime of being Jewish. Mao offed 100 million Chinese with his little agricultural experiment.
Mark my words. If any politician including Obama has ordered such a despicable act as assassination and is not immediately impeached then prosecuted for murder then may God have mercy on all our souls. That's because those with this power will soon say anyone who opposes their authority is a terrorist and it is only a few steps from there to extermination. Obama's government and private mouthpieces have even already labeled Americans who legally oppose their socialist policies as "domestic terrorists."
So if we examine the historical pattern Obama has the same growing opposition from the American people as did Bill Clinton during his presidency with the militia movement - but Obama's opposition is ten times bigger. Clinton silenced his opposition by blowing up a building in Oklahoma with explosives placed inside the building "assassinating" hundreds of innocent American bureaucrats sitting in their offices then blaming it on a cat named McVeigh who was with some militia. Most Americans still don't realize Clinton committed this treason because all the local officials, and there were many who knew this was an inside job, have all either been "assassinated" by the secret police or intimidated into silence.
So if you're still okay with assassination it could be you next time getting blown out of your office by a president "assassinating" you because of his sagging poll numbers. Maybe it will be your wife, parents, children or grand children. Don't cry though because you asked for it.