I'd characterize the typical U.S. leftist as not really having the foggiest clue about Marx beyond his having some vaguely important relationship to Soviet-style communism, and as not having a clear stance regarding communism or capitalism... either because they actively support a mixed economy, or because they are confused about economics.
I think this is true, but with the caveat that a lot of the memes circulating among educated leftists in the US are basically Marxian in their approach to class and economics. Usually not orthodox Marxist, though, and they fall well short of cohering into a complete Marxian analysis anywhere outside of sociology departments and the odd punk show.
Joe Left is generally not aware of this. Joe Right probably has a confused idea of the relation ("communist" is a dirty word in the US, so right-wing news outlets don't miss opportunities to use it), but is unaware of the Marxian/Marxist distinction and thinks it makes Joe Left an outright commie.
I don't know enough about Marxianism (either orthodox or heterodox) to have a useful opinion about how popular Marxian memes are among the US left (or, for that matter, the US right), but I certainly agree that that's a different question than how well informed J Left is about Marx, and an interesting one.
I'm pleased to announce the first annual survey of effective altruists. This is a short survey of around 40 questions (generally multiple choice), which several collaborators and I have put a great deal of work into and would be very grateful if you took. I'll offer $250 of my own money to one participant.
Take the survey at http://survey.effectivealtruismhub.com/
The survey should yield some interesting results such as EAs' political and religious views, what actions they take, and the causes they favour and donate to. It will also enable useful applications which will be launched immediately afterwards, such as a map of EAs with contact details and a cause-neutral register of planned donations or pledges which can be verified each year. I'll also provide an open platform for followup surveys and other actions people can take. If you'd like to suggest questions, email me or comment.
Anonymised results will be shared publicly and not belong to any individual or organisation. The most robust privacy practices will be followed, with clear opt-ins and opt-outs.
I'd like to thank Jacy Anthis, Ben Landau-Taylor, David Moss and Peter Hurford for their help.
Other surveys' results, and predictions for this one
Other surveys have had intriguing results. For example, Joey Savoie and Xio Kikauka's interviewed 42 often highly active EAs over Skype, and found that they generally had left-leaning parents, donated on average 10%, and were altruistic before becoming EAs. The time they spent on EA activities was correlated with the percentage they donated (0.4), the time their parents spend volunteering (0.3), and the percentage of their friends who were EAs (0.3).
80,000 Hours also released a questionnaire and, while this was mainly focused on their impact, it yielded a list of which careers people plan to pursue: 16% for academia, 9% for both finance and software engineering, and 8% for both medicine and non-profits.
I'd be curious to hear people's predictions as to what the results of this survey will be. You might enjoy reading or sharing them here. For my part, I'd imagine we have few conservatives or even libertarians, are over 70% male, and have directed most of our donations to poverty charities.