The contracts should be re-worded to work as the nominations ones do. If a candidate dies, all contracts in the group are settled and then a new set is re-launched. These rules could probably also be modified with merging logic to preserve open interest. . There are a few factors contributing to the favorite/longshot bias on Intrade, e.g, the fees, the lack of interest paid to most positions, the difficulty of funding accounts, liquidity preference ...