Since 2010, he has been one of the chief advocates for a 28th Amendment to overturn Citizens United v. FEC and allow the U.S. Congress and states to set reasonable limits on campaign spending in U.S.

[8] In 2009, as a private attorney, Clements represented several public interest organizations with a U.S. Supreme Court amicus brief in the Citizens United case.

Clements argued: "[w]hether or not the Supreme Court's decision in Citizens United explicitly addresses 'corporate rights' under the Constitution, a holding that overrules Austin and McConnell would rest on the remarkable - and erroneous - assumption that the Constitution provides corporations with First Amendment and Fourteenth Amendment rights equivalent to those of people for purposes of political expenditures."

[10][11] In 2012, Jeff co-founded Whaleback Partners LLC, provides accessible start-up funding for farmers and businesses engaged in local, sustainable agriculture.

[12] In 2016, Clements founded American Promise to accelerate the movement to win a 28th amendment by building cross partisan, grassroots infrastructure across the United States.