The electability argument goes like this:
- The universe of potential Clinton voters contains X number of people who would vote for Trump or abstain from voting if Sanders were nominated.
- The universe of potential Sanders voters contains Y number of people who would vote for Trump or abstain from voting if Clinton were nominated.
- X > Y
- Therefore, Clinton is more electable than Sanders.
That is, the electability argument is based on the premise that Clinton voters are more pro-Trump/more likely to abstain from voting than Sanders voters. During the primary, it was remarkable that the same pro-Clinton camp that argued that Sanders people were moral monsters were also implicitly arguing that Clinton people have a much higher level of pro-Trump sympathy.
After the primary, it is remarkable that premise 3 has been somehow reversed. Whereas previously we were supposed to vote for Clinton to please the crypto-Trumpists in her camp, now apparently it is the Bernie people who have more crypto-Trumpists in their camp. Of course, if the new story is the true story, then that also means the electability argument used during the primary was totally backwards.