Not sure where your history is from, but first, you might want to do a little easy research about the 1968 political convention in Chicago.  I doubt if any of those protesting in Chicago where Nixon supportors.  Machine gunning of union protesters a Republican supported campaign?  Again, reading a little history shows that the businesses involved in that were mostly "apolitical" and as likely to support a Democrat as a Republican.  And the civil rights abuses in the south in the 50's-60's - the white south political organizations were almost exclusively Democrat during that era.