If I define "political actions" to mean actual legislation and executive orders with regards to health care, it has been a busy few years.
The Patient Protection and Affordable Care Act of 2010 was passed by Congress and signed by President Obama, with the main effects to be phased in over time. The law ended lifetime caps on insurance benefits, allowed parents to keep children on their insurance until the age of 26, and prohibited pre-existing conditions from being used to deny someone health coverage.
It also mandates that all Americans buy health insurance by 2014, or the government can tax/fine them in order to purchase a plan for them. This is the most controversial aspect and has led to numerous lawsuits from the states claiming it goes beyond the federal government's authority to require Americans to buy a product from a private business like an insurance company. Ultimately, the case will end up in the Supreme Court.
There have been any number of political actions on the subject of health care in recent years. Here, I will define "political actions" as those that are meant to try to affect people's opinions on health care or that are meant to transmit the people's opinions to their leaders.
One of the major political actions on health care in recent years is the Republican attempt to, as seen in this link, mobilize public opinion against President Obama's health care law and to use the opposition as a means of promoting Republican electoral prospects. These attempts have generally involved trying to convince voters that the Obama plan is anti-American and dangerous to the US economy.
Similarly, we can currently see Democratic political actions on health care, particularly on the issue of Medicare. Here, we see Democrats trying to convince voters that Republicans would destroy the Medicare program. They hope, like the Republicans, to use these political actions to mobilize public opinion and to use that opinion to improve their ability to win elections.