Is this significant? A Republican today won a special election for a Texas state senate seat in a predominately black and Hispanic district that was won by Hillary Clinton by 12% and hasn’t been held by a Republican for more than a hundred years.
It is dangerous to extrapolate the results from a single state legislative district to the wider nation. Nonetheless, for a Republican to win such a seat in a district whose two biggest demographics are Hispanic and black suggests we might yet see a historic shift this coming election. If the Democrats can no longer depend on these voters, they will find it difficult to win any national elections.