Bizzump so we get more responses.
I think that the best way is made a poll with these options: Approve (Fed), Disapprove (Fed), Undecided (Fed), Approve (Lab), ecc... with all the parties (Fed, Lab, D-R, TPP, Others, Ind) and at the end make a calculation with weighing all the votes in proportion of the total members. For example. The Labor has the 30% (random number) and the Labor votes weigh for 30% of the total.
Here's the issue with that - It gets so bogged down with options that it's harder to read and harder to deal with. The better way to do what you want to do would be to make a SurveyMonkey poll. Just a straight approve-disapprove with a high amount of responses is better than an approve-disapprove poll with more demographic options but fewer responses.