Hedge-fund honcho David Einhorn is getting so much campaign practice, he should consider a mayoral run.

With large Apple shareholders continuing to come out against him days before a pivotal corporate vote, Einhorn yesterday held a conference call in hopes of swaying investors in the iPad maker to his cause.

The founder of $8 billion Greenlight Capital has been on the war path to get Apple to return some of its $137 billion cash hoard to shareholders. Specifically, Einhorn wants CEO Tim Cook to adopt his plan for preferred shares that pay an annual 4 percent dividend.

“We will send a clear message to the board that we are all dissatisfied with Apple’s capital allocation strategy,” Einhorn declared in an hour-long call, which came with a 55-page Web presentation.