Minnesota is full of people with continental European ancestry. Look at Europe.
And... a rapidly increasing Somali muslim demographic. I highly doubt those folks will be touchscreening for the GOPers on their ballot.
I don't think there's much of a correlation there. The fact that the state is still predominantly white should help the GOP, not hurt it.
Most of those people "with continental European ancestry" are probably third, fourth, fifth generation American and the large majority of those have little connection to the old country.
Their ancestors mostly came over in the nineteenth century and worked hard to overcome serious problems without any government handouts. For the most part they embodied the American ethic and they became sound American citizens. Socialism in Europe had little to do with them; it didn't really begin in earnest until after they had established themselves in the US>
Any affinity for socialism that today's descendants from continental Europe have is not connected to their immigrant forebears, but rather has more to do with propaganda they were exposed to in school and are still exposed to via the MSM.