Top ten figures from American history

Curious data from USA Today:

1. Martin Luther King Jr.: 67%2.
2. Rosa Parks: 60%3.
3. Harriet Tubman: 44%4.
4. Susan B. Anthony: 34%5.
5. Benjamin Franklin: 29%6.
6. Amelia Earhart: 25%7.
7. Oprah Winfrey: 22%8.
8. Marilyn Monroe: 19%9.
9. Thomas Edison: 18%10.
10. Albert Einstein: 16%

Hat tip to Wretchard.