hillary clinton seen as honest and trustworthy by just 38 per cent of americans , new poll shows .
new headaches include revelations about foreign funds flowing into the clintons ' family foundation while she was secretary of state .
$ 2.35 million came from family foundation of company chairman involved in selling canadian uranium company to russian state-owned firm .
hillary helped approve that $ 610 million sale in 2010 , which gave vladimir putin-linked company control over one-fifth of america 's uranium .
bill clinton received $ 26 million in speaking fees from foundation donors , including $ 500,000 from an investment bank tied to putin and the kremlin .
chelsea clinton defended the foundation that now bears her name , saying it 's ` among the most transparent ' philanthropies in the us .