A hedge fund run by Democrat Rep. Alan Grayson is under fire from both conservatives and allies of his Democratic rival, as the Florida lawmaker runs for the Senate seat vacated by GOP presidential hopeful Marco Rubio. Grayson is listed as manager of a trio of interconnected funds created in 2011 after he lost a congressional bid. The funds — two based in the Cayman Islands and another in Delaware — are administered by two U.S. LLCs that he also owns.  The wealthy congressman maintains his dealings are above board, and there has been no official finding to the contrary....