Good news for the White House: Lots of people know about Obamacare. The bad news: Those people aren't necessarily the ones the White House believes really need to know about its sweeping health reform efforts.

This comes from the latest Gallup poll, which asked Americans whether they had heard about the requirement to purchase health insurance that will take effect in Jan. 1:

Overall awareness of the requirement to carry health insurance is an impressive 81 percent. Segregate the polling sample by insurance status, and you see that awareness among those mostly likely affected by the law is much lower.

And this poll asked people only about the individual mandate, a health care law provision that was challenged all the way up to the Supreme Court. It did not ask whether people know about the health law's subsidies for low- and middle-income Americans to buy health insurance. Separate research suggests that even fewer Americans know about that part of the health care law.