Atlanta may elect its first White Mayor in more than 30 years

The Wall Street Journal reports that Atlanta is poised to elect its first white mayor in 30 years.

The news here is not that blacks are voting for a white person. That's been going on for ever. The news is that notwithstanding the fact that blacks are a majority in Atlanta, the white candidate has more support among the black community that the black candidates.
This raises for me a couple of questions that the article did not answer: (a)are white atlantans voting as a bloc in favor the white candidate or any one of the black candidates? (b) what happens if this race goes to a run-off between the leading white candidate and a black candidate, does it become racialized?