SPRINGFIELD, Ill. — As another set of limits on giving money to political candidates fails the constitutional test, one campaign finance reformer says it’s time to look elsewhere.

“You need to figure out ways to get more individual donors, with small contributions, into the systems,” said political science professor Kent Redfield of the University of Illinois at Springfield. “Rather than assuming that, somehow, you can build a firewall between private money and public elections.”

Redfield said a firewall was never likely and is all but impossible now that the U.S. Supreme Court has struck down an overall cap on campaign donations.