If 100 people voted $1 for Trump, and 100 people voted $1 for Hillary, both sides would have $100 worth of bids, and your risk/reward would be 1:1, meaning you could only double or nothing.
If the sides are uneven however, the risk/reward shifts. If you have $700 in votes for Hillary, and $100 for Trump, then a vote for trump will yield 7:1, netting a nice gain. A vote for Hillary would only yield money back + a small piece of $100. (assuming you win in both cases, if you lose, you get $0).
STEEM and SBD are different currencies, so they have their own pools.
A shame that I didn't have SBD to bet. Thanks.