"AFC" stands for American Federation for Children. It is lead by Betty De Vos. She is President Trump's nominee for Secretary of Education. She is a conservative Christian that supports school choice otherwise known as school vouchers. Guns in school are important to her for the defense of the children against bears that might appear on campus.
Guess this number sells its use to any group regardless of political agenda. Press "1" for to urge Michael Bennet to support Betsy DeVos. As if. The line itself is dead (rings a few times and then gets a circuit busy), but they leave a telephone number with a 202 area code. AFC is for school choice, meaning the decline of public education in America. Wish I had known that it went straight to the Senator's office, I, too, would have complimented him and urged him to keep up the good fight.
Answering or pressing any number simply marks your number as active in their database and lists you as someone likely to answer the phone, and to take action. Scammers use this technique--using bogus causes--to qualify their lists so they can sell them to telemarketers. Your best best is to just not answer or you'll be forever plagued by these calls.