I'd think you couldn't but there is an upvoted comment by @Emrakul on @WaxEagle's nomination post. Is there a place other than the nomination screen where you're supposed to look at these? Will it work the same way for the election phase?
This was a bug, and was disabled when it was caught during the SO election that is being held concurrently with ours. See this for more information:
It looks like the restriction is for just the nomination phase. However, we will not have a primary (unless more than 7 candidates step forwards this afternoon), and I think comments disappear during the voting phase.