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Ms. Bowser chatted with Shepherd Park voters around 8 a.m., while volunteers for opponents Baruti Jahi, Max Skolnik and Renee L. Bowser stood nearby. When Ms. McGhee asked the incumbent to sign the D.C. Public Trust petition, Ms. Bowser demurred and reiterated her belief that a ban would send corporate contributions underground with even less transparency and accountability.

“It will just move it around,” Ms. Bowser told signature gatherers.