Chairman of U.S. Commodity Futures Trading Commission Gary Gensler (R) and Securities and Exchange Commission Chairman Mary Schapiro.    By Russell Blinch
   WASHINGTON, July 7 (Reuters) – The top regulator of U.S. futures markets is considering a clampdown on excessive speculation in energy and commodity trading by restricting holdings of big players, part of a broader move by the Obama administration to stabilize the financial markets. (more…)