Washington (CNN) - With the clock ticking towards two crucial deadlines, a new national poll indicates congressional Republicans would shoulder more blame than President Barack Obama for a possible government shutdown.
But according to a CNN/ORC International survey, support for the president's health care law appears to be waning.
The poll's Wednesday release comes less than three weeks before the current measure funding the federal government expires on September 30, setting up another budget battle between congressional Republicans and the White House. That deadline comes one day before a key element in the Affordable Care Act, better known as Obamacare, takes effect. Enrollment in the health care exchanges that form the core of the new law begins on October 1.
Some conservative lawmakers, backed by some tea party and other grassroots conservative groups, are using upcoming budget battle as leverage, vowing to oppose any measure that provides funding for the federal government from including money for the health care law. A shutdown of the government would kick in if Congress doesn't hammer out a new spending plan by the beginning of next month, which is the start of the new federal budget year.
According to the poll, if a government shutdown lasted only a few days, 11% of Americans think that would cause a crisis and another 38% forecast major problems. But if a shutdown lasted a few weeks, the number who think the country would face a crisis rises from 11% to 31%, and the number who believe major problems would result increases a bit to 43%.
So whom would Americans blame if the government shutdown?
"Only a third would consider President Barack Obama responsible for a shutdown, with 51% pointing a finger at the GOP - up from 40% who felt that way earlier this year," says CNN Polling Director Keating Holland.
The White House and congressional Republicans also appear to be headed towards a showdown over raising the nation's $16.7 trillion debt limit. The country could hit its debt limit sometime from mid-October to early November.
Seventeen percent of those polled say failure to extend the debt ceiling would cause a crisis, with another 45% forecasting major problems for the country. The poll indicates a quarter would blame the president if the debt ceiling were not raised, with 54% holding congressional Republicans responsible.
According to the poll, support for Obamacare appears to be dropping.
In January 51% said they favored all or most of the provisions in the new law. Now that figure is down to 39%.
Support has dropped in virtually all demographic categories, but it has fallen the farthest among two core Democratic groups - women and Americans who make less than $50,000.
"Those are also the two groups that are most likely to pay attention to health insurance issues, and possibly the ones most likely to be affected by any changes," adds Holland. "That may be particularly true for lower-income Americans who are most likely to have part-time jobs, be on Medicaid, or not currently have health insurance and thus be the first to have to navigate the new system."
"Change is often scary - even change that promises to bring long-term benefits - and it may not be surprising that Americans are getting a case of cold feet as these new policies start to kick in."
The poll's release comes after a major push the past six weeks by conservative groups to try and defund the health care law. There has also been a huge disparity over the past couple of years in ad spending over the issue, with groups opposed to Obamacare greatly outspending those in favor of the measure. The new poll suggests the negative advertising may be taking a toll. The forces opposed to the health care law have also been much more active on social media than those supportive of the law. And the one year delay in the implementation of the employer mandate, another key component of the law, which was well publicized earlier this year, may have also contributed to the loss of support.
According to CNN/ORC numbers released Monday, 42% of the public approves of the job Obama is doing on health care, with 36% giving him a thumbs up on the budget deficit. Both figures are little changed from earlier this year and both are below the president's general approval rating of 45%.
The poll was conducted for CNN by ORC International September 6-8, with 1,022 adult Americans questioned by telephone. The survey's overall sampling error is plus or minus three percentage points.