Oh wait, corporate contributions are only a tiny percentage! Wow, this party is funded by The People!
Now scroll all the way down (previous to last page) to see corporate donors. Observe every single developer in Vancouver being on that list donating tens of thousands of dollars, more than any other corporation.
Notice how that doesn't stack up with the pie chart you just saw. Now scroll back to the top of the page to and observe that the contribution-bysource piechart is by number of contributions rather than by aggregate value.
This should tell you enough.