What Are My Responsibilities If I File a Affidavit of Support?

I have listened to you on the radio and you have discussed the Affidavit of Support. Now I have a problem, a very good friend of mine has asked me to do an affidavit of support to supplement her’s for her husband. If I do this, what are my responsibilities?
I get this question a lot. In a nutshell you will be equally responsible for the financial support of the beneficiary for up to 10 years until and unless (s)he becomes a citizen of the U.S. or earns 40 quarters of social security income.