WASHINGTON - About two-thirds of Americans believe Republican former US President George W. Bush - not current US Democratic President Barack Obama - is responsible for the nation's struggling economy, according to a Gallup poll released on Thursday.

About 68 percent of the more than 1,000 adults surveyed nationwide said Bush, who left office in January 2009, deserves a "moderate amount" or a "great deal" of the blame for the US economic woes compared to 52% who pointed to his successor Obama, the poll found.

The results were released as Obama prepared to give a major economic speech later on Thursday as part of his campaign to win re-election on Nov. 6. He is seeking to convince voters that his economic remedies are working and that his Republican rival Mitt Romney's policies would trigger an economic crisis.

Poll respondents who identified themselves as Republicans were split, with 49% saying Bush deserved a moderate amount or great deal of the blame while 51% said Bush deserved not much of the blame or none at all. They expressed even more blame for Obama, however, with 83% holding him largely responsible for the state of the economy, the poll found.

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