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In this file photo: A chalk-written sign on a sidewalk gives directions to President Obama's grassroots event at Cornell College in Mount Vernon, Iowa, on Oct. 17, 2012. In January 2020, a free speech litigation group announced it is taking Iowa State University for, among other rules, a ban on sidewalk chalk. (Associated Press) **FILE**
Photo by: Nam Y. Huh
In this file photo: A chalk-written sign on a sidewalk gives directions to President Obama's grassroots event at Cornell College in Mount Vernon, Iowa, on Oct. 17, 2012. In January 2020, a free speech litigation group announced it is taking Iowa State University for, among other rules, a ban on sidewalk chalk. (Associated Press) **FILE**

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