What will be the futures drawn upon? There aren't many political events that will make this as a continuous market. Moreover, this seems to be more of a binary option - wherein the final outcome is binary - rather than a futures contract. Can you elaborate more?
The futures markets are actually rather robust, in their existing form. There are longer-term plays such as Presidential/Congressional/International elections, but there are also shorter term events such as Presidential approval, Congressional Approval, direction of country (Positive/Negative), as well as daily Gallup ratings - most of which are updated daily/weekly.
One of the sites that currently does this (fiat only), Predict It, has 50+ active markets at most any given time.
Example:
And like in the example, within each category there are several possible options one could wager on. Their method is that the winning choice pays $1, losers pay $0, and options can be sold numerous times with 'No' prices balancing 'Yes' prices.
There are also other potential markets based on events, such as 'Assault weapons ban by end of 2018?', or 'Presidential tweets between [date range]', and issues that pop up during various news cycles.
With a lot of the potential markets the results aren't specifically binary since, like in the above picture, you have several potential ranges that polling can fall under. Most of this data can be pulled from trusted polling aggregaters (RCP), and set against the contract using Oraclize It.