One almost gets the feeling like Trump is actively sabotaging all GOP races this Fall. I say "almost" because I'm unfortunately quite familiar with the mental condition he makes others suffer from. It could, though, be a combination of both. The OP is right though. The GOP's hairbrained scheme, Cheney style, was to smash and trash Hillary with real (trivial) and fabricated "horrors!" If they had just promoted a good candidate, one that already knows how to govern, handle a broken economy and with foreign policy experience, there would be no need to contrast at all. He would simply just outshine Hillary in a way she could never recover from.
Instead, Trump has gaffed so many times and is so much worse of a liar, a charlatan and a fraud than she is, the GOP is helpless, dead in the water with zero wind in their sails and zero wind in sight. It really would take Hillary drowning a litter of puppies as she chanted along with terrorists "death to America!" on video to maybe give Trump a slight edge in the polls.
Perhaps the RNC should convene and enact a rule that says if a candidate bashes other (Congressional) candidates or political leaders of the same party in an election cycle, that candidate is unfit to represent the party as a whole and must be removed from the ticket. A party should not be required to pay $ election funds to prop up a candidate that is gutting it from the inside out.