I think what it definitely has to say is:

Mission 1/2/3/4/5
Who was the leader, who was going on the mission and those that rejected it (might be easier to say who approved it since if you say who rejected it, this will be a smaller number since the mission was approved). Example:

Failed Mission #1 - White chosen White, Brown & Red
Rejected: Brown, Pink
Success Mission #2 - Red chosen Brown, Red, Blue & Pink
Rejected: White, Green, Pink

Since it always becomes: "Who was on mission X again?" (also write them as colors otherwise long names are still going to screw it up).

And then the results very clearly of the previous mission. In similar way:

Mission #3 Vote 3 - Green chosen Green, Blue, Purple & Pink
Rejected: White, Green, Pink, Blue, Orange, Yellow

So this one was rejected, it would stay there but if Vote 4 would become rejected, then this one would dissappear and then Vote 4 would take its place and stays there until Vote 5 is also over. If it would be approved, it becomes a mention of the actual list.

Seperated like this:

Current Mission (you need... ehm... 3 lines? Mission Details, Who voted and who didnt)
-------- (this is technically 1 line)
Previous Result of the previous Vote (you need 2 lines here)
-------- (this is technically 1 line)
Previous earlier done Missions Vote History. (you need 2 lines for each Mission)

Or is it maybe possible that you change the Notebook instead? That way you would have infinitely more room :P.

Maximum amount of lines: 3+2+2+(2*5)=17 lines
But maybe you don't need the Mission 5 since the game is over after that point ^^.

Also to EVERYONE making a suggestion, you need to somehow be able to place it on 25 lines MAX.

引用自 QuakeNLD：

...So this one was rejected, it would stay there but if Vote 4 would become rejected, then this one would dissappear and then Vote 4 would take its place and stays there until Vote 5 is also over. If it would be approved, it becomes a mention of the actual list....

Hmm... so you think that any failed votes shouldn't be saved onced a mission is sucessful? It would certianly clear up space, though is that info something that could be useful and people may wish to return to?

Edit: Well I added said method so we can see how it works in game.

Something that is useful in secret hitler consolidator is that when a vote is done, it will display who voted pass and fail on the back 4 walls as text. This can be really helpful to quickly check who voted what.