Along with any business you've have dealings with in the last eighteen months.
from DoNotCall.gov (emphasis mine):
30. Are calls from political organizations or calls soliciting for charities covered?
Political solicitations are not covered by the TSR at all, since they are not included in its definition of “telemarketing.” Charities are not covered by the requirements of the national registry. However, if a third-party telemarketer is calling on behalf of a charity, a consumer may ask not to receive any more calls from, or on behalf of, that specific charity. If a third-party telemarketer calls again on behalf of that charity, the telemarketer may be subject to a fine of up to $11,000.
31. What about telephone surveys?
If the call is really for the sole purpose of conducting a survey, it is not covered. Only telemarketing calls are covered — that is, calls that solicit sales of goods or services. Callers purporting to take a survey, but also offering to sell goods or services, must comply with the National Do Not Call Registry.
32. My number is on the National Do Not Call Registry. After I bought something from a company, a telemarketer representing that organization called me. Is this a violation?
No. By purchasing something from the company, you established a business relationship with the company. As a result, even if you put your number on the National Do Not Call Registry, that company may call you for up to 18 months after your last purchase or delivery from it, or your last payment to it, unless you ask the company not to call again. In that case, the company must honor your request not to call. If they subsequently call you again, they may be subject to a fine of up to $11,000.
An established business relationship with a company also will be created if you make an inquiry to the company, or submit an application to it. This kind of established business relationship exists for three months after the inquiry or application. During this time, the company can call you.
If you make a specific request to that company not to call you, however, then the company may not call you, even if you have an established business relationship with that company.