President Barack Obama again hailed the Patient Protection and Affordable Care Act last week, citing rising enrollment numbers in the insurance policies offered under the law. Urging fellow Democrats to stress that point, the president insisted that "there is a strong, good, right story to tell," adding: "If Republicans want to spend all their time talking about repealing a law that's working, that's their business."

But Republicans aren't the only ones still expressing serious concerns about Obamacare.

As Rep. Stephen Lynch, D-Mass., warned on a Boston radio show last week: "There's all these taxes and fees that are the tough medicine, that up to now they haven't implemented. I don't know who's going to do that."

Speculating on his fellow Democrats' assessment of those repeated postponements, Rep. Ryan said perhaps "they expect the next administration is going to put these penalties in place. I think that's the time it's going to hit the fan."

Rep. Lynch and 33 other House Democrats joined every congressional Republican in voting against that landmark legislation in 2010. Later that year, American voters returned the House to GOP control, largely as a result of public disapproval of Obamacare.

In 2012, the president did win re-election and Democrats slightly strengthened their House and Senate hands. But Rep. Lynch predicted that in this year's congressional elections, his party "will lose seats in the House" and "may lose the Senate" because of the law.

Still, the White House touts its count of 8 million Americans having signed up for policies under its insurance exchanges - a million more than the administration's goal - as proof of the law's success.

Yet confusion over the law continues to plague Obamacare - and Democrats. Rep. Colleen Hanabusa, D-Hawaii, recently said she and her constituents were "frustrated and embarrassed" by numerous flaws in that state's Affordable Care Act exchange - and that she remained "very concerned" about how the state's $204 million federal grant under the law "has been allocated and spent."

Oregon scrapped its problem-plagued Obamacare exchange program on Friday.

And San Francisco's KPIX-TV reported this week that, according to the California Medical Association, Anthem Blue Shield mistakenly listed 965 non-participating doctors as care providers in the policies it offered under the law's exchange program in that state. So what do the Obamacare insurance customers who bought such policies on that erroneous assumption do now?

Among the many other troubling, lingering questions about the ACA:

How many of the people who have signed up for the law's insurance plans across the country have paid any premiums?

How many of them needed to buy new policies in the first place because the law eliminated their previous coverage?

How many more times will the administration override legislative authority by delaying the law's mandates via constitutionally dubious executive fiat?

And how long can those taxes and fees that are supposed to cover Obamacare's costs - that "tough medicine" cited by Rep. Lynch - be delayed without making the Affordable Care Act even more unaffordable?