Granted, public opinion on health care legislation is often incoherent and contradictory. While there has never been high support for the ACA, many of its central provisions, such as prohibiting insurers from turning away customers based on pre-existing conditions, are extremely popular.

Another poll last month showed that one-third of voters weren't aware that "Obamacare" was the same thing as the "Affordable Care Act."

Ryan's bill has taken a beating from both the right and the left on Capitol Hill since he unveiled it on March 6.

Democrats in both the House and the Senate are united in opposition to the American Health Care Act, which if enacted would likely lead to millions of Americans losing health care coverage that they have gained through the Affordable Care Act, either by way of the expansion of Medicaid or income-based tax credits and subsidies to purchase insurance on Healthcare.gov.

Several conservative Republicans, meanwhile, have said the bill does not go far enough in repealing the framework put in place by the ACA. Some have taken to calling it "Obamacare-lite."

Finally, some moderate Republicans in the Senate who say they can't support legislation that will undo the expansion of Medicaid that their states are benefiting from.

As a result of the disparate forces of opposition, the bill does not appear to have nearly enough votes to pass the Senate. That's despite the assist from the Congressional Budget Office, which earlier this projected that the bill would reduce the deficit, meaning that Republicans would not have to break a Democratic filibuster to get the bill passed.