ANNAPOLIS, Md. (AP) - Maryland Democratic Reps. Christopher Van Hollen and John Sarbanes are joining Democratic state lawmakers in pushing for a U.S. constitutional amendment to overturn the Supreme Court's Citizens United case.

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Van Hollen and Sarbanes were in Annapolis on Thursday to launch a campaign to gather signatures opposing the 2010 ruling that stripped away some limits on campaign contributions.

Van Hollen says the court's decision could lead to a corporate takeover of the Democratic process. Sarbanes admits it won't be easy.

A constitutional amendment requires a two-thirds vote in both houses of Congress.

Then, three-fourths of the state legislatures would have to approve it. But Sarbanes says the stakes are high, and it makes sense to try in this case.