Um...why would soaring health care costs be identified as the top concern of the American people if the "Affordable" Care Act were lowering costs like it claimed it would rather than exploding them, exactly as conservatives (apparently the only people involved with any kind of basic economic literacy) said would happen from the beginning?
There's a lot of "duh" packed into that question, so give me a moment to unpack it for you.
First, obviously, what the top listed political concern at the moment is depends a lot on what other problems there are at the moment. In a year with a big terrorist attack, that'll jump to the top of the list. In a year when we're in a recession, or just coming out of one, that will. If hundreds of American GIs are coming home from wars in body bags, that'll be near the top of the list. Right now, and for the last five years or so, things have been going pretty well, which cuts down on the competition for top political concerns, and allows more focus on things that would be more back-burner items in times of crisis.
Second, again obviously, what topics people are focused on depends a lot on what topics the media are focusing on. Some years, the media will focus a lot on, say, mass shootings, or some other trendy topic. Often that has little to do with what's actually going on, statistically. For example, illegal immigration is down in recent years -- from about 12.2 million unauthorized immigrants in 2006 to somewhere around 10.7 million now (according to the Pew Research Center). Yet immigration has crept up the list of topics people are focusing on, because nativist scaremongers have really focused on it. If Trump were to spend his days tweeting about failing infrastructure, and hyping every deadly accident that could be attributed to poor infrastructure maintenance, the media would follow suit, and infrastructure would rise on the list of things people want Congress to focus on, without any change in the situation to justify the change in priorities. Right now, there are a lot of stories about medical costs, even though they're rising more slowly than normal, so that's risen on the list of things people want Congress to focus on.
As for the idea that Obamacare is "exploding" costs, that's untrue. Turns out healthcare spending has been rising considerably more slowly since Obamacare became law than in the years leading up to it:
https://fred.stlouisfed.org/series/HLTHSCPCHCSA
Now that you realize that, would you care to revise your opinion?
