Here is a piece of the answer:
“With all respect, the fact is we have
four dead Americans was it because of a protest or was it because of
guys out for a walk one night who decided they’d go kill some
Americans,” Clinton shouted. “What difference at this point does it
make? It is our job to figure out what happened and do everything we can
to prevent it from ever happening again, senator.”
I seems to some people that the "What difference at this point does it make?" contradicts "It is our job to figure out what happened..."
or is it
One possible way of looking at "What difference ..." is classifying it as a rhetorical question. If so, it does not contradict the "It is our job...". Of course, that way of looking at it would mean it was, in fact an admission that "...we were misled..." so that is not likely the way Secretary Clinton intended it but who knows.
Video of Q&A here