[SkyMarshal]

It's a useful vehicle for starting the process, bringing attention to the issue, clearly explaining what and why, providing a single point of action for people to focus on, and gauging support.

If all that goes well and the petition gets enough signatures and visibility, then that's a good point to segue off into the more difficult organizational problem of getting all those people to actually call their rep.

Additionally, the President has to sign such a law eventually anyway, so starting movements with a plea to the President has some benefit in that regard as well.