I thought about this before, but found out that it's not true, we shouldn't try to vote what doesn't deserve voting.
Graduating the site means basically that the site have a good group of core users who understand the community specifications and can hold the important rules after the site graduates (in our case, the most important rules are authenticity and citation). So after graduation the site will not turn into a mess.
I think we should just act as normal, vote what deserves voting (both up and down), if that was sufficient to the site to graduate, then great! if not, then the site still needs a period of time to reach the limitations needed to graduate.
Trying to "Cheat the system" is not a good idea, maybe it will help graduating the site early, but it really might end up with ruining the site with spam questions and answers if the community wasn't as wise as it should be. We should wait until the community is really good and grown, and then, probably without being aware of that, the site will automatically graduate.
I like to remind that the visit/day rate jumped to more than 700 and then dropped accidentally to about 400, this is because we were promoting the site and it's OK, but this is a live example that such "campaigns" will not be good on the long run.