What is the main reason the Obama campaign was able to raise more than $750 million, which at the time was more than any other candidate in history?
A. The campaign utilized a sophisticated website and dozens of social networking sites to connect
with millions of potential donors.
B. Obama had important special interest groups and corporations as donors.
C. The Democratic party made considerable contributions to the campaign
D. Obama called on a long list of donors from his previous elections to the US Senate.