Here's a good post by hilzoy about the McCain speech. One piece:
There's no way to make this out to be anything but a lie:George Lakoff taught me that it's very hard to accuse a politician of lying, because there are so many possible excuses for a lie. The speaker can say that the statement was partially true or that he/she had incorrect information or was telling a white lie for the audience's own good."His plan will force small businesses to cut jobs, reduce wages, and force families into a government-run health care system where a bureaucrat stands between you and your doctor." [from McCain's speech]Here's a link to Obama's health plan. If anyone can find the part about forcing anyone into a government-run health care system, I'll eat my hat. (Remember the controversy from the primaries about mandates, and how Obama didn't have them?)
In this case, however, I think McCain's lie is as pure as they come. It's absolutely false, McCain must know that it is false, and he is telling the lie to deceive the American public so that they will make him president. Why can't a journalist ask "How do you expect people to have any trust in you when you are lying about Obama's health care program?"
UPDATE: Dean Baker makes the same point and asks why the press hasn't reported this.