He was in the news in the US because of his rantings:
http://articles.latimes.com/2011/jun/17/world/la-fg-south-africa-malema-20110617 There are multiple dimensions to 'known' information. What is known, how many know it, what they can do to affect the market, what else they might be focusing on (like Greece).
How could that not move the needle on some fund manager who thinks 'woo. just like Chavez. avoid."?
'Everything is in the price' (EIITP) is nice and simple, but it's just not true. EMT (
http://en.wikipedia.org/wiki/Efficient-market_hypothesis) has multiple forms, which at least one EIITP is equivalent to. Nice quote from the wiki site: "Various studies have pointed out signs of inefficiency in financial markets. Critics have blamed the belief in rational markets for much of the late-2000s financial crisis. In response, proponents of the hypothesis have stated that market efficiency does not mean having no uncertainty about the future, that market efficiency is a simplification of the world which may not always hold true, and that the market is practically efficient for investment purposes for most individuals"
'Simplification' and 'practically efficient'. So, it's not true but we can assume it's close enough for long-term investing. Not trading. Not Malema, today, a couple days after his speech and years before he gets any real power, while Greece et al are influences in the market.