Are these sentences correct:
1) We have to find out what as many as possible of them think about this issue.
2) I would like to know what as many as possible of the witnesses have seen.
They sound awkward.
I'd say "...as many of them as possible ...", "as many of the witnesses as possible ..."
Actually, I'd say something like, "I'd like to get as many eyewitness accounts as possible"; "I'd like to get as many opinions about the issue from them as possible."; "We need to get as many opinions about the issue as we can."