That Bill fella is a busy guy. Seems like he's always trying to stop something.
What's the justification (he asks without reading the article)?
If they can't carry the primary it seems unlikely they're electable.
If they're going to leech votes from the person who did perhaps they need to consider the platform of the person they defeated.
If the problem is that one person has become a cult of personality and you fear your party will crumble against them maybe you should have considered the consequences of your actions earlier on.