You're right, but Kirchnerism will end up being a left-wing party with no more than 10% of support. There are far more mestizos than that.
That said, Argentina will hardly see any real change because of our idiosyncrasy, and this go beyond race/class/ethnicity.
Look at Chile. They have far more mestizos than Argentina and they are far better off than us. I hope we follow suit and try a real change, from scratch.
Do you live in Argentina? I ask because of the "Location Italy"