They worry because they see themselves as the target of conservative and moderate voters in their district. I pity them not.
It is too bad the GOP in the US congress is afraid of their own shadow. The so called moderates of the GOP are responsible for the downfall of the Republican party. The people of this country are sloppily figuring out the what the left wants for this country will destroy it as the economic and military superpower in once was.
The democrats feel they must pass a health care bill. To them even a terrible bill is better than no bill when NO health care bill is better than a poor one. The people of this country did not want a total overhaul of the health care system. Adding illegal aliens to the system will bring about the demise of this country at even a faster pace. Obama says illegal aliens will not be covered under this bill. He does not tell the whole truth. He does not say that he will not grant them amnesty. He will add them to the health care system by making granting them amnesty and making the legal.
Big government will destroy this country, reducing it to socialist russia model. Obama is on the course to unilaterally disarm the US both militarily and economically.