Mail
As I understand it, a real letter in an envelope has the highest influence on a legislator, especially if it doesn't look like a form letter.
e-mails are so easy to generate in huge numbers that I wouldn't be surprised if they didn't get trashed.
I've written to newspapers a bit, not so much lately. Got an award and a free dinner for one thing I wrote for the newspaper once. But I doubt that a typical letter to the editor has a lot of influence on people.
I suspect that it wouldn't be that hard to talk a paper into printing a longer item if it's good, though.