If dems did winner takes all

[Mr. Morden]

In a 2-person race, PR actually tends to (effectively) end things more quickly, since it becomes really hard to catch up once you've fallen behind (though I guess the possibility of superdelegates overturning the pledged delegates complicates that somewhat).  With WTA, even if you're far behind, you can make up a lot of ground with just a few 51%-49% wins.