A majority of respondents, 53%, believe the allegations, despite his denials. Among Republicans, 39% believed them to be true.
"The most striking thing is that Herman Cain is actually seeing a fairly substantial decline in favourability ratings towards him, particularly among Republicans" said Chris Jackson from Ipsos.
The Republican presidential candidate, who had been enjoying a surge in the polls which made him the latest challenger to frontrunner Mitt Romney, is struggling to draw a line under allegations that he sexually harassed at least three female employees when head of the association. Two women reportedly received financial settlements after the incidents.
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