A very interesting analysis by the National Committee for an Effective Congress (NCEC). Republicans are now hopelessly outnumbered on the coasts, and are rapidly becoming a minority in the West and Midwest (with the exception of rural districts).

According to the NCEC:

Republicans are now in jeopardy of evolving into a regional party with a solid foundation in the South and to a lesser extent in the rural Midwest and Rocky Mountain states. While becoming an endangered minority in the remainder of the country.

....

If the Republicans are isolated as a regional party, dominant in the South, competitive in the Midwest but hopelessly outnumbered on both coasts, their chances of regaining a majority of the House in the near future are remote.

Republicans built up their party by pandering to intolerance, which helped them build a majority by taking over in the South and rural parts of the North.

How ironic that now they are so married to the outdated policies they used to build their party and the voters that must have them (anti-gay initiatives, anti-environmentalism, racially tinged politics) that in only a generation they have offended much of the rest of the country to the point where they are almost extinct on the federal level in New England and New York (and watch as Sununu, Shays, Collins, Fossella's seat, Walsh's seat, Reynolds' seat and perhaps others all go bye bye, further speeding up this process).