Could a trend be developing?

Check this out:

The candidate is Otto Banks, a 33-year-old African-American and the biggest vote-getter in Harrisburg, a predominantly black and overwhelmingly Democratic city where a Republican hasn't been elected to the city council in nearly 20 years.
Like everyone else on the all-black city council, Mr. Banks was a Democrat -- that is, until this March when he announced he had become disenchanted and was joining the Republicans.

In the last two national elections the Republicans got around 10 percent of the black vote. If Democrats couldn't win with 90% of the black vote, how will they do with 70% or 60%.