The Democratic National Committee’s creation of a Jewish American Council on Sept. 30 points to a problem that election results can obscure: Jewish voters may remain reliably Democratic even as some become less certain that the Democratic Party is still their political home. The council is therefore a sort of political smoke alarm: its existence doesn't establish that Jewish Democrats are abandoning the party -- the available evidence says the opposite. The new organization suggests something more politically consequential: Democratic leaders increasingly see Jewish loyalty as something to maintain, rather than something that the party can simply inherit.The latest Jewish...