The New York Times claimed that President Obama only "misspoke" the 24 times he claimed that people who liked their plans could keep them. A 2009 White House blog post, however, dispels any doubt about "misspeaking"—it straight-up says that it is a fact that people who like their insurance can keep it.
From August 4, 2009 blog post titled "Facts Are Stubborn Things":
For the record, the President has consistently said that if you like your insurance plan, your doctor, or both, you will be able to keep them. He has even proposed eight consumer protections relating specifically to the health insurance industry.
Then there's this video, which is pretty awkward now that at least 3.5 million people have lost their (much-liked) healthcare plans:
For the record, here is the dictionary definition of "misspeak."
1: to speak (as a word) incorrectly
2: to express (oneself) imperfectly or incorrectly
...and here is the definition of "lie"
1: to make an untrue statement with intent to deceive
2: to create a false or misleading impression
Since the Obama administration clearly knew that lots of people would not be able to keep the plans they liked, "lie" is the more correct word to describe Obama's promises. They were intentionally spoken to deceive people into approving of his law. Hence, a lie.
Facts are indeed very stubborn things.