If you'd like to donate to the mayor who is fighting for gigabit fiber for Seattle (and thus cancel out a portion of Comcast's donations), you can do so here: https://services.myngp.com/ngponlineservices/contribution.as...
People/entities can donate to Super PACs that cannot donate to candidates, but that's because Super PACs -- or "independent-expenditure only committees" -- are not controlled by and do not coordinate with candidates