@engineer,
Sure... it was written by one Clinton supporter. So what.
You can find thousands of Bernie supporters who are reluctantly supporting Clinton. Many of us will vote for Clinton even though we are a little bitter about how the political establishment pushed her on us (and I am not just talking about Bernie, several decent plausible candidates were pushed out before the primary).
Even this writer was ambivalent even as he tried to be as "enthusiastic" as he could. Even in is support he said "You have made mistakes, some of them grave, and some of them unforgivable."
But my point is that this sort of thing doesn't help... if the goal is to convince reluctant Hillary supporters to be more solid or to convince still wavering Bernie supporters to commit. If the goal is to make enthusiastic Hillary supporters feel better about themselves, maybe this hits the mark.