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A new poll shows most Americans don't believe Lee Harvey Oswald acted alone in the assassination of President John F. Kennedy.

The CBS poll marking the 50th anniversary of the JFK assassination shows 61 percent don't think Oswald acted on his own and 56 percent believe there was an official cover-up to keep the truth from the public.  These numbers however, continue to decline over the years.

Other results from the poll show most Americans continue to regard the assassination as an important event in American history, and a majority believe Kennedy will be remembered as a great or good president.

This Friday, November 22nd marks the 50th anniversary of the JFK assassination.  (Metro Networks Inc.)