1. Dual Member Proportional Representation
A PR system proposed by Sean Graham

2. Dual Member Proportional Representation
Each riding has two seats
Parties can nominate two candidates in each riding.
Voters vote for the party of their choice.
If a party receives the most votes in a riding their primary candidate (the first listed) will be elected.
The second seat in each riding will be filled according to proportional representation principles.

3. Ballot - Vote for one option
Jeanne might win the second riding seat.
James Cook
Alice Lake
Liberal Party x
Cory Reid
Jeanne Scott
Conservative Party
Mary Gregory
John Wong
NDP
Amy King
Gary Young
Green Party
Justin White
Independent

4. How do you achieve Proportional Representation?.
How do you achieve Proportional Representation?
The first step is to decide how many seats each party should get.

5. Simulation of the NL 2015 Election
Let’s use a simulation of the 2015 NL provincial election
Simulation of the NL 2015 Election
The 40 ridings are collapsed into 20 ridings each with 2 seats.
20 seats are given to the parties that scored the highest in each riding
20 seats are reserved to create proportional representation.
Liberals
Conservatives
NDP
FPTP Elected
The First 20 Seats won on the ballot
17 seats 3 seats seats
57.7% % %
23.1 seats seats seats
% of Vote
PR Seats
20 extra Seats

6. The second step
Parties calculate what percentage of the vote they got in each riding.
Each party then ranks the ridings according to the percentage of votes they received.
An algorithm is used to assign each party the seats they deserve in the ridings where they got the highest percentage of votes.
Parties that have already elected an MHA in a particular riding divide their party’s percentage of the riding vote in half so that it doesn’t get counted twice.

7. Conservative Ranking by District
Liberals = 6 Seats
Conservatives = 9 Seats
NDP = 5 Seats
Conservative Ranking by District
Riding % of Vote % % % % % % % % % % % %
Elected
1 Lib
2 Lib
5 Cons
6 Cons
9 Lib
3 Lib
4 Cons
8 Lib
7 Lib
10 Lib
NDP
Lib
Con
Lib
Con
11 Lib
12 Lib
15 Lib
16 Lib
19 Lib
13 Lib
14 Lib
18 Lib
17 Lib
20 Lib
Newfoundland and Labrador Simulation

8. Just like First-past-the-Post
What’s to remember?
Ridings are twice as large but you have two MHAs,
usually from different parties.
The first seat in each riding is given to the leading candidate of the party who gets the most votes.
You’ve now elected half your MHAs.
(in the case of our province that would be 20 seats)
Just like First-past-the-Post

9. The Proportional Representation Process
Figure out how many seats each party should get to achieve PR.
Each party ranks their ridings.
An algorithm is used to match each extra party’s extra seats with the ridings where the party got the highest voter turnout.
Around 15% of ridings will end up assigning the second seat to a party that did not rank second in the riding votes.

10. What are the advantages of Duel Member Proportional Representation?
DMP achieves a higher level of proportionality than most other PR systems.
The integrity of geographical ridings is largely maintained.
All MHAs are attached to a riding
There are advantages to having two MHAs to call upon.

11. Disadvantages of Dual Member Proportional Representation
Dual Member Proportional Representation requires the collapse of two ridings into one. However,there will be two MHAs elected from each riding.
The procedure for assigning the second seat can seem complicated. However the ballot is simple to understand.