It's easy if you have a few co-conspirators. Find five quotes, post them on the quotes thread, ask 9 people to vote each one up (and vote them up as Eliezer Yudkowsky). It probably wouldn't even take that many, since some would certainly be voted up on their own.

But perhaps it would be better, if possible, to hide (or least offer the option to hide) the author of a top-level post. Anyone who cared enough to closely track karma could tell who posted it, but it would weed out a lot of knee-jerk EY upvotes.