No. It would add to what you already have.
But if you creating new address on your wallet and adding Ark to that new address then you can vote for someone else with it.

Here is easy to understand, you can vote 1 delegate per address. If your wallet have 8 Ark addresses then you could vote for 8 delegates. Every time you adding more Ark to address which already voted then you wouldn't do anything else, it would adding weight to what you already have in there.