Let's see, I was a political science undergrad (after switching from physics), then got a PhD in the subject.

As an undergrad I was at a top-10 ranked liberal arts college. I took 10 poli sci courses with 8 different professors, and none of them could conceivably be called a Marxist. None of the poli-sci profs were "Marxist" in fact, though maybe one or two of 8 in the History dept could be. The class I took on the politics of the Middle East was taught by a prof who was also an ordained rabbi, an old aquaintance of Israeli diplomat Abba Eban.

As a graduate student taking classes at MIT and Harvard, not one prof I dealt with personally was anything like a Marxist. My advisor was a republican, in fact, and several others were libertarian/free market oriented on economic and regulatory issues, but voted Democratic due to the social conservatism and emphasis on evangelical Christianity of the Republicans.

We did have a prof who left shortly after I arrived who was somewhat self-conciously Marxist in the sense of using that sort of structural economic analysis, but not as a source of political programs -- he wrote about how companies would be shifting to post-industrial, networked and working-empowring forms of organization. Stuff that got assigned in some business schools.

Now, if by "Marxist" Tom would include anyone who favors a Swedish-style welfare state or who opposed SDI in the 1980s, well sure, there were plenty of those. I'd say my profs were about 8 to 1 liberal vs conservative, with a significant minority who would have gone so far as wanting us to emulate European states like Sweden or France.

But if wanting single-payer health care is enough to lump you in with Lenin and Che, than "Marxist" is a term that doesn't mean very much. You might as well say that anyone who favored Bush's tax cuts is an Ayn Rand disciple.