The members who've decided not to attend (which CNN is tracking here) also come from districts that are more black and less Jewish than the average in the Democratic Party. In part, that's a function of opposition from the Congressional Black Caucus, members of which often represent more heavily black parts of the country. And, as a correlation, those districts tend to be more supportive of President Obama.
We pulled data on the districts that are represented by those planning to skip the speech and compared them to Democratic and Republican districts at large. Here's how they stack up:
On average, the boycotting districts are 10 percentage points more black than the average of all Democratic districts -- and 14 points more black than the national average of all House districts. But they are also 1.1 percentage points less Jewish, according to data from the Jewish Federation of North America. The districts lean more Democratic (7 percentage points more so on the Cook Partisan Voter Index) and, on average, went for Obama in 2012 by almost 50 points -- 14 points more heavily than Democratic districts on the whole.
This is certainly skewed by the fact that it's only a few districts, and those heavily represented by members of the Congressional Black Caucus. But that's almost certainly linked to support in those districts for the president, to whom the speech invitation is seen by some as an affront.
"To me, it is somewhat of an insult to the president of the United States," Rep. Greg Meeks (D-N.Y.) told Politico. That sentiment is almost certainly shared.