If you're in the USA, don't donate more than $200 to any political campaign. If you donate more than $200, then those contributions have to be reported to the FEC (Federal Election Commission). Those reports are publicly available, and include your email address and phone number. Other campaigns, then, harvest that information to build their own list.
$0 might be a better number, since campaigns will also sell their donor lists to other campaigns, but having your information out there in public means anyone running for dog catcher anywhere in the country can reach out to you to beg for money.
$0 might be a better number, since campaigns will also sell their donor lists to other campaigns, but having your information out there in public means anyone running for dog catcher anywhere in the country can reach out to you to beg for money.