Quote Originally Posted by RightOfCenter View Post
To me this looks basically the same as the German proportional representation system, which I'm all for. Unless there is a difference that I'm not seeing.
The German system (if I understand it correctly) works slightly differently. Everyone gets to vote for the party to control the legislature, as well as the representative from their own district. All of the district winners automatically get seats in the legislature, and then a number of "at large" representatives are added from a slate of candidates provided by the parties, so that the overall distribution of power in the legislature was proportional.

I kinda like this idea, and think it could work in this country too if we were willing to expand the size of the House of Representatives (say, to 600 people). So for example, if the Democrats won 49% of the nationwide vote, Republicans won 45%, and Libertarians won 6%, they would each get exactly that percentage of seats in the House. We'd start by filling the 435 seats that were won by district representatives, and then the "at large" seats would be allocated among the parties as necessary to make sure that they each had the correct number of seats.

Mixed-member proportional representation - Wikipedia, the free encyclopedia

But it's important to note that this system has the potential for electoral abuse if the proper safeguards aren't put into place:
Political parties can also abuse the system by splitting their party into two, if this is allowed by electoral law. One subdivision of the party contests the constituency seats, the other contests the list seats. This will produce an overhang. They can co-ordinate their campaign and work together within the legislature, while remaining legally separate entities. This can also give other advantages in areas such as party funding.

For instance in the Italian general election, 2001, one of the two main coalitions (the House of Freedoms, which opposed the MMP system), linked many of their constituency candidates to a decoy list (liste civetta) in the proportional parts, under the name Abolizione Scorporo. As a defensive move, the other coalition, Olive Tree, felt obliged to do the same, under the name Paese Nuovo. The constituency seats won by each coalition would not reduce the number of proportional seats they received. Between them, the two decoy lists won 360 of the 475 constituency seats, more than half of the total of 630 seats available, despite winning a combined total of less than 0.2% of the national proportional part of the vote. In the case of Forza Italia (part of the House of Freedoms), the tactic was so successful that it did not have enough candidates in the proportional part to receive as many seats as it in fact won, missing out on 12 seats.