In a statement accompanying the announcement, Clinton pledges to promote Securities and Exchange Commission "rulemaking requiring publicly traded companies to disclose all political spending to their shareholders" and to sign an "executive order requiring federal government contractors to fully disclose all political spending." She has discussed versions of those ideas on the campaign trail, but the forum of Netroots Nation — a conference in its 11th year that she visited in person only once — was a striking place to make the statement.

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Clinton's campaign previewed the announcement for some progressive groups, which gave it their seal of approval. "Hillary Clinton's commitment to overturning Citizens United, and her other systemic proposals like public financing of congressional elections, are key to improving our chances of victory on every other issue," said Marissa Barrow, a spokeswoman for the Progressive Change Campaign Committee.

Since 2010, the Citizens United decision has become a metonym for a series of conservative Supreme Court decisions that unwound campaign finance regulations. Democrats have repeatedly tried to pass disclosure measures, as well as an amendment to the Constitution, intended to reverse the decisions. Republicans, often led by Sen. Ted Cruz (Tex.), have characterized those efforts as attacks on the First Amendment.

Even though the case was fought over an anti-Hillary Clinton documentary, Sen. Bernie Sanders (Vt.) became its most prominent critic in the 2016 primaries. He never finished a speech without mentioning Citizens United v. Federal Election Commission, blaming it for the money gushing into politics, and pledging to appoint a Supreme Court that would undo it.