I don't know why Obama and Biden don't just say, "We screwed up," about Libya.
Because they're politicians?
But seriously, they could do that, but it would be a huge risk. It might come across as sincere and honest, and help them get votes, but it also opens them up to attack.
Read this next bit in Mitt Romney's voice: "Even this President doesn't think he's doing a good job of protecting our country. He admitted to not providing proper security for our soldiers and ambassadors in Libya."
Now read this one in scary political ad narrator voice: "President Obama refused to provide troops to defend our embassies in Libya and Egypt, even though they asked for extra security. (Play clip of Obama saying 'we made a mistake'). Obama's "mistake" cost the lives of Americans who were bravely serving their country overseas. America deserves better than that. On November 6th, support Mitt Romney, the only candidate who will protect America."
Obama still has the advantage in the polls, which generally leads to caution (and he's a generally pretty risk-averse guy anyway)
I can't find anywhere where Obamacare takes from Medicare. No cutting it at all.
It does call for $716 billion in cuts to Medicare over ten years, but Ryan is still lying about it. Here is Politifact's take:
Ryan said Obama "funneled" $716 billion out of Medicare "at the expense of the elderly." This gives a very misleading impression.
In fact, the law limits payments to health care providers and insurers to try to reduce the rapid growth of future Medicare spending. Lawmakers said they hoped the measures would improve care and efficiency. Those savings, spread out over the next 10 years, are then used to offset costs created by the law (especially coverage for the uninsured) so that the overall law doesn't add to the deficit. Ryan’s statement is exaggerated and we rate it Mostly False.
It is also worth noting that Ryan's budget plan called for the exact same amount of cuts to Medicare. As Bill Clinton said at the DNC, "it takes brass to criticize someone for doing the thing that you did."