Big jump in gold sale spurs manipulation talk Some analysts say only manipulation is government's attempt to take down oil By Moming Zhou, MarketWatch Last update: 7:54 p.m. EDT Aug. 29, 2008 NEW YORK (MarketWatch) -- Recent heat from Congress and regulators, along with public speculation, over whether commodity prices are being manipulated has also reached gold pits, where the debate was stirred by a surge in bets last month that gold prices would fall. "Congress is already investigating allegations of manipulation in the oil market, and it seems likely that it is only a matter of time before a...