I agree that it definitely depends on your individual MOC. Ours were similar to wang93's in that everything for the senators was online and there was no real reason to contact them beforehand, but you needed to request the info from the congressman. However, I tend to disagree with the advice to write rather than email, especially as you get further into the process. It seemed in our case that if we sent anything by mail (other than the final completed packet), we had no idea of confirmation, if it got to anyone, or was just read by someone in the mailroom and then tossed. My son tried making phone calls and leaving messages and wouldn't get a reply, or would weeks later. But once we got the staffer contacts, he found that emails were nearly always answered instantaneously - even in the evening or on weekends. So scanning and emailing and getting a quick reply (and documentation that they had received it) made that route much better with our MOC's. You'll have to find out which yours prefer but using whatever they DO prefer makes it more likely that it will be processed more quickly.