If you wanted to see a law making it mandatory for all 10th grade students to receive a computer from the government for educational purposes,
a. you would have to convince your local state senator that it was a good idea
b. you could meet with your house of representative and ask him to buy all 10th graders computers
c. you could draft a piece of legislation then meet with the representative or her staff and convince them to submit the legislation
d. you would introduce the legislation on the senate floor and hope your state's national senator likes it and votes for it