As at KeyCorp, the vote at JPMorgan Chase is nonbinding. But it has drawn much more attention, and comes after Dimon has faced months of criticism and regulatory scrutiny of JPMorgan's size, governance and handling of the London Whale affair. The shareholder proposal has turned into something of a no-confidence vote on Dimon, who has reportedly threatened to quit if investors go against him. JPMorgan's board could follow KeyCorp's example in the case of a loss, but corporate governance experts say that doing so risks compounding the problem.