What would prevent you from using a mixer to send a small output to several addresses then using those addresses to vote for your outcome?
You can vote from whatever address you want.
If I am asking for investors to build a library and ask 100 people for $10,000 each. Does it matter if one person takes $30,000 and sends it through money launderers, changes to a different currency, then buys gold with that currency and then sells it for 3 separate $10,000 lumps of cash and then gives that money to me to build the library?
The outcome would be the same. It is all about whether or not the funding reaches a certain point or not. If you are willing to pay more than other people to have a project go forward, there is no stopping you.