Which Was an Important Aspect of Rick Perry's Highly Successful

Which was an important aspect of Rick Perry's highly successful 2010 gubernatorial campaign?

A) He relied heavily on direct mail and phone banks.
B) He enlisted an army of young volunteers to go door-to-door soliciting votes.
C) He discouraged supporters from using social media on his behalf.
D) He relied on friendly bloggers and social media more than on the editorial boards of newspapers.
E) He made it a point to visit and deliver a campaign speech in each and every county in Texas.