6 year terms for President: Basically whoever is in the big chair gets 6 years, no more, no less. They can't run again afterwards either. This eliminates all this 4 years/4 years+campaigning in the moddle stuff that people seem to have grown tired of. Plus in his 4th year, how can he get anything at all done if he's constantly campaigning?
Popular Vote elects the President: We do away with the whole electoral college and just elect the President based on popular vote. Your vote might actually count for something now! (probably not, but at least there's a bigger illusion that it does.)
Election Day a Federal Holiday: Because people like to complain that, "they just have the hardest time finding time to vote". Hey, its either this, or we move to a 36 hour day.
Legalize Pot: Legalize it and tax the heck out of it. This not only stimulates the economy, but gives you something to do at work. It also makes those Magic Eye books much more enjoyable.
Age Limits for Justices: Ginsberg is like 80 now, and rumor has it, she'll be the nect to go. Scalia ia around 74, but he'll probably have to be wheeled out on a stretcher. Clarence Thomas has been past his prime since he was 30. (come on, you know its true. ) Should there be an age limit for these guys?