Question: Is the hundreds of millions being self funded by the billionaires an income tax event? They have to cash out their stocks do they not?
It depends on how they hold their assets. More likely than not, they will be selling some assets, such as stocks, and will generated capital gains.
That's a taxable event.
Unless, somehow contributing to your own campaign, or your own PAC, is tax deductible, which I doubt.
So, the taxes generated by liquidating assets with embedded gains are the same as one would pay for buying an office as one would pay for buying a yacht.