At the time, neither "USA Today" nor "The Observer" was able to verify which of the sixty-plus candidates it was.
USA Today reported the name of the candidate
The statement says that they did not know which one, so they could not have reported it.
( z1 report :ARG0 ( z2 newspaper :name ( z3 name :op "USA" :op "Today" ) ) :ARG1 ( z4 thing :ARG2-of ( z5 name :ARG1 ( z6 candidate ) ) ) )