Their knowledge of economics obviously remains as broad and deep as their knowledge of military affairs, I see.
Companies do nothing for purely political reasons, at least not successful companies that want to survive long-term. If they support a candidate, it is because they see it as an issue of economic advantage, either positively in the sense of favorable policy goals or negatively in buying what's up for sale before a competitor or counter-interest buys it first (I.e. our sleazy bastards in Congress and the current White House).
If companies are holding cash now, it's not because they want to support one party or the other for some arcane political end, but because they are uncertain what stupid shit the Oministration is likely to try to do next during the Dems waning days controlling of Congress, and how it will impact them. They aren't going to willingly commit their cash reserves into a highly-uncertain legal environment.
This far from the election (Which is a million years away in business time for labor expense ROI, especially temp labor, though not so much for capital improvement expenditures), the possible effect of holding onto their cash on the outcome of elections in November is a ridiculously trivial consideration.