What Was One of the Key Strategies That Helped Barack

What was one of the key strategies that helped Barack Obama win both of his elections for president?

A) Investing heavily in direct mail to reach older voters in their homes
B) Identifying and microtargeting potential younger voters through their email and social media accounts
C) Traveling to less populated parts of the country to target marginalized rural voters
D) Putting lots of resources into television advertisements in conservative states to win them over
E) Writing a daily blog of his experiences on the campaign trail and taking e-questions from voters