To be able to migrate to NZ all applicants (heads of family if application includes spouse and children) need to pass an English test caled IELTS with 6.5 out of 9. That's equivalent to passing first year university/college writing class and high school English with a B+. Given our far-left politicians (despite having very advanced degrees and reputed to be the highest qualified group of politicians) fail high school English I guess not many American libs will make it either. ;-)
It's not easy for them to get into Canada either, unless they got tons of money, or a needed job skill, and a sponsor. (Most of those sponsors prefer arepublican)
The favorite spots for them are in southern Ontario or Vancouver, both of those places, while a bit warmer, are already saturated with welfare, crime, and high deficit governments, and a hodge podge of other immigrants. Vancouver isn't that nice of a place anymore, and decent housing is very expensive. Alberta is booming, but it's conservative town, not the ideal place for a democrat. the prairies have basicly voted out all the liberals as well. Plus it's way too cold for a southerner. Also not a cheap place to live either.
The real fact is, North America is getting less lefty liberal, even in Canada social programs are getting chopped left and right because they are just too costly, and poorly run.