In general, in my lifetime (since 1964), our presidential candidates have been a sorry bunch of ninnies. It seems that Americans will vote against their own best interests joyfully if the sorrow is sold by some slick talking guy with white teeth. Which doesn't explain Nixon, but election rigging does.
Another Obama presidency would be horrible, but no better and no worse than a Romney or Santorum presidency, or four more years of W. Bush because they are in essence the same individual, with the same goals and objectives, just different ways of flavoring the poison.
Just wait until 2016 when Jeb Bush runs and once again voters turn out to elect anoth member of the most treasonous clan in US history.