Please consider taking a look at these four table templates and use the resources linked to in their talk pages to expand them.

Once these are up to date, I would like (someone) to use R to write code that converts these into graphs with a 95% CI, as was done by User:T.seppelt here, or as was done here.

In a similar vein, creating a graph which combines all opinion polls on UK general elections would be a nice goal.