Generally balanced article, although much of the discussion involves the Republicans. Should be noted the estrangement of the Democratic Blue Dogs from the Democratic Congressional leadership, and the desire that many from centrist, conservative areas should be expendable and vote for the health care law.
the following paragraph notable.
This trend has significant implications for the future trajectory of both parties. Democrats have more to lose politically if their party continues its leftward drift, because conservatives outnumber liberals by a 2-to-1 margin, according to surveys of the American electorate, most recently a Gallup poll released in January. In the modern era, Democrats have depended on a coalition of liberals and moderates to win elections, and the 2010 midterm losses nearly decimated the latter faction. But Republicans have lately shown little tolerance for ideological apostasy on issues like immigration, which would allow them to expand their appeal beyond the conservative base.