Your hardcore Democrat voter never will. If anything, he will figure out a way to blame Republicans for tricking him into dropping the bone.
The Fable is about moderate Republican CANDIDATES. They drop the base of conservatives who originally supported them to reach for; imaginary moderate voters, Republican-leaning Latino voters, conservative women who are pro-abortion, etc. etc, none of whom actually exist in any large numbers, yet they let go of their tried and true conservative base in pursuit of those imaginary voters.