Apparently Ed Markey wasn't the only politician to wear pins they wore at the SOTU, Ilhan Omar wore a 1870 pin to push for police reform, Elizabeth Warren, Mazie Hirono, Suzanne Bonamici, and Jack Reed also wore Crayons for Kids pins to call attention the child care issue.
https://www.businessinsider.com/state-of-the-union-1870-pins-buttons-crayon-congress-explained-2023-2