I actually think that's how all political campaigns should work as well. Be funded only by individuals, just like votes are done only by individuals, not corporations, and the donations should be capped at a few thousand dollars at most.
The way political donations work right now it's like a parallel voting system, where instead of each vote being (more or less) equal, the discrepancies can be enormous. One can donate millions or tens of millions or dollars, while others are donating a few tens of dollars or none. Who do you think the politician will listen to first? They'd rather listen to the guy who gave them $1 million, than 1000 other people who voted for the opposite position.
The system is incredibly skewed because of this parallel "faux voting" system through huge money donations. It's almost like the "real" voting system doesn't matter anymore, and the more donations come through the other one, the less relevant the first one is.
I've wanted for a while a way of taking a small % of your taxes and allowing you the government agencies (or NGOs?) that you prefer. Maybe even a small % would be a useful thing to compete over - for instance NASA / NIH / NSF might get huge funding boosts if a certain segment of the population might give 1% of their taxes to such causes.
It would be interesting to set up a website that took donations for a cause, like a bounty board. The first politician (or group of politicians) to enact the policy would receive a donation to their next political campaign. This would probably only be effective if corporate spending was limited but... just a thought.
Although that does make me wonder... what if Government organizations had to use something like Kickstarter to get funding?