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Is this inside The Roku Channel? If not, Roku has no control over the ads you see. My guess is with the runoff election there they (the candidates) must feel any advertising is good. Personally, I wish all political ads were banned, just like tobacco.
Dan Roku Stick (3600), Ultra (4640), Ultra (4670), Ultra (4800), Premiere (3920), Insignia 720p Roku TV, Sharp 4K Roku TV, Nvidia Shield, Windows 10 Pro x64 running Serviio and Plex on a wired Gigabit network.