Start with government contractors—groups that receive taxpayer money in exchange for goods and services. Because contractors receive federal funds, their relationships with politicians are especially prone to corruption. That’s why they are prohibited from contributing to candidates’ campaigns. Yet the same groups can spend unlimited sums to elect politicians without any public scrutiny. The president can correct this inconsistency by requiring any contractor who receives taxpayer funds to disclose its dark-money spending. In 2011, the administration drafted an executive order to do just that, but it was leaked and quickly quashed by Republicans in Congress. Since then, the problem has only gotten worse. It’s time to reintroduce the proposal. Just as Obama led on minimum-wage reform by raising contractors’ pay floor, he can lead on transparency by requiring more contractor disclosure.

Then there’s the matter of corporate spending. When corporations hide their political activity, shareholders have no way of knowing if their money is used to support causes they disagree with. In 2013, for example, a D.C.-based trade group spent $11 million to oppose a Washington state initiative to require genetically-modified-food labeling. The measure failed, and a state investigation revealed the money came almost entirely from corporate backers like Coca-Cola and General Mills. If not for the investigation, shareholders would have been unaware of their contribution to defeating the GMO-labeling initiative. The Securities and Exchange Commission is responsible for providing shareholders with information about the companies they finance. Obama could encourage the agency to require publicly traded corporations to reveal their dark-money spending.

How about political ads themselves? The president could request that the Federal Communications Commission require ad disclaimers—the text at the end of an ad identifying the sponsoring organization—to actually reveal who is funding the organization. That way, top funders would no longer be able to hide behind vaguely named groups like Winning Our Future or American Tradition Partnership (two groups cited for campaign-finance violations).

Of course, Congress needs to be part of the process of increasing disclosure. But as government reformers know, it is difficult to convince legislators up for reelection to alter the system that got them elected in the first place. Democracy would be better off if Obama used the power of the executive to fight back against secret election spending.