Where do those without health insurance live?

The Census Bureau sought to find that out, for the first time, in a survey taken last year and released in September. Over all, it found that 9.9 percent of children lack any health insurance, half the rate for adults under 65.

But there was widespread variation in coverage. Children in Texas, the state with the least health insurance, are more than eight times as likely not to have it than children in Massachusetts, the state with the broadest coverage.

Those who lack health insurance now are far more likely to live in states that usually vote Republican  the states whose senators and representatives are least likely to support a law to extend coverage.

That would seem to indicate that Republican constituents are the ones who would most benefit from passage of universal health insurance coverage. But an analysis of Congressional districts within those states indicates that those without health insurance are much more likely to live in strongly Democratic Congressional districts. Many of those contain large minority populations with relatively low incomes.