Yehuda Bauer, writing in Haaretz Nov. 19th, (Hebrew only, and already hidden behind their paywall) enumerates various democratic nation states with large minorities: The Latvians, for example, make up only 59.4% of the population in their nation state (Russians are 27.5%, only 56% of those Russians are Latvian citizens). Estonians make up 69% of their own nation state, while 25.6% are Russians. Kazakhs make up 63% of the population of their nation state, and the lack of democracy there isn't a matter of ethnicity - the country is equally undemocratic for all.
Menachem Lorberbaum and Carlo Strenger, both of Tel Aviv University, likewise take aim at the notion that the Jews can't have a nation state with a Palestinian minority, though near the end they also criticize the direction Israel's right is going. But that's fine. The point isn't that left-leaning professors - as these three all are - need to support Lieberman, rather that prominent left-leaning professors are still more critical of the ideas coming from the far left.