Pension insurer shifted to stocks Concern increases as losses mount; Failing plans could overwhelm agency <a href="http://www.boston.com/news/nation/washington/articles/2009/03/30/pension_insurer_shifted_to_stocks/" rel="nofollow" target="_blank">http://www.boston.com/news/nation/washington/articles/2009/03/30/pension_insurer_shifted_to_stocks/</a>