Last year, as a growing schism over Israel tore at the Democratic Party, Andrew M. Cuomo threw himself into the fray. He announced he would lead a new advocacy group leveraging his clout as New York’s former governor to beat back growing anti-Israel sentiment on the left.

The group, Never Again, NOW!, offered an ambitious slate of plans for the summer and fall. In a speech outlining them at a synagogue in the Hamptons last summer, Mr. Cuomo likened himself to a “Shabbos goy,” a non-Jew who traditionally helps Jewish people on the Sabbath.

“The hour is getting late, my friends,” he said, “and now is the time to act.”

Almost a year later, though, the Cuomo group’s promises appear to have amounted to little beyond a few private informational receptions and opinion essays.

Never Again, NOW! never convened the summer symposium it said would expose “the truth about anti-Zionist rhetoric” on college campuses, nor an advertised lecture series in the fall. It has yet to launch the educational hub on Israel and Hamas still promised on its bare-bones web page. And AdImpact, a tracking firm, could find no record that the television ads the group said would air last July actually did.

Now, as Mr. Cuomo begins a comeback campaign for mayor of New York City, the group’s work provides one of the clearest windows into how he has sought to use well-timed political projects to re-enter the public sphere after his scandal-tarred resignation as governor. Others included a national gun safety group and a new political action committee to support favored candidates.