Power

You're defending the glorious U.S.A.—you have purple mountain majesties and amber waves of grain all on your side. Even the Supreme Court defers to you.

Though maybe that's not the worst thing. (Source)

You're like Batman, Spiderman, Captain America, and The Green Lantern all wrapped up in one. Sadly, the job doesn't come with the cape and tights, or the super-human abilities.

But you will have the power of your wit, and your mind, and your speech to convince the judge and jury to convict the guilty.

You also decide what a defendant is going to be charged with and have the power to plea bargain a reduced sentence without consulting anyone else.

People's fates are in your hands.