A place to explain your preferences, discuss them, and maybe change your mind.
Some comments on this thread are cross-posted from a text box which appears when you reach the end of the voting process, but everyone is welcome to post here whenever.
You can read about all the candidates here.
Some of the difference in votes vs. personal donations comes from the tax deductible status of donations. Donations to (for example) Arthropoda are only tax-deductible in the USA, meaning that many potential donors living in other countries might donate elsewhere. In a donor lottery this is no longer a concern.
Other factors like currency conversion fees when donating to charities that only take donations in dollars may have similar effects.