In fact, I usually want to, at first, mark it as maybe-a-dupe and see what others think. Can I do this?
What you can do is, in cases where your vote is binding (Gold Tag Badges, Mods), save your vote for when only one/few are missing. The same could apply to Reopen votes (which, if you are Mod or have badge, are also binding).
I've seen several Mods and Gold Badge holders use and some encourage this technique.
This will give the Community time to handle the post organically and also give time for the OP to clarify and improve the post (perhaps to a point where the closing is no longer needed).
Doing this also lets you reduce the number of times you have to "Hammer" a post, and let you save those for when they are really needed (cases where the closing or reopening is obvious or timely needed).