The American Conservative
Well, it all depends on what data you emphasize.
Gallup put out two recent pieces suggesting the answer is: yes. The first demonstrated that, over the course of time, whites as a whole have gotten more Republican, and more reliably so:
In recent years, party preferences have been more polarized than was the case in the 1990s and most of the 2000s. For example, in 2010, nonwhites’ net party identification and leanings showed a 49-point Democratic advantage, and whites were 12 percentage points more Republican than Democratic. The resulting 61-point racial and ethnic gap in party preferences is the largest Gallup has measured in the last 20 years. Since 2008, the racial gaps in party preferences have been 55 points or higher each year; prior to 2008, the gaps reached as high as 55 points only in 1997 and 2000.