The only person who could unite the country to get through a crisis like this would be a moderately sane Republican.
There is nothing - nothing at all - that a President Hillary Clinton could do such that Fox News wouldn't be screaming at her 24/7. As we saw in the economic collapse in 2008, Republicans will do nothing to help the country if it might benefit a Democratic president.
But as we saw after 9/11, the media and Democrats will get behind a Republican president. [Update: Every D & R senator voted for the >$2 trillion package today; not a single R senator voted for Obama's <$1 trillion one.]