Actually, there is a chain of fools involved in these kinds of slander. It begins with the neo-con zealots, who feel that it's OK to lie to the general public to get the public to support what the neo-cons know is right. (Example: "weapons of mass destruction", "Saddam supported 9/11 terrorists", etc. They tell whatever lie they feel will help them to do what they believe needs doing.) In this case, they of course feel that both Barrack Obama and Hillary Clinton should not become president, so what better lie to tell than one that sets them against each other and slanders both. But for their lie to work, they have find a news outlet that will spread it. And in America, today, we have a number of media outlets who have discovered that they can gain an audience and make a lot of money by stirring up people's fears and prejudices, and who will gladly latch on to any lie that will help them do this. They are professional muck-rakers, who have discovered that there is always an audience for muck. Rush Limbaugh is the modern reinventer of this mass-media much-raking, but it actually has a long history going back through people like Senator McCarthy and Father Charles Goughlin. Getting rich and famous by playing on people prejudice and hate is nothing new.
So now days it's media outlets like Fox and the Washington Times who are always looking for some good slander to boost their ratings or their circulation. And the neo-con zealots are happy to provide it to them. And this is how these stories get out into the public consciousness. All the more so as the mainstream media too often reports on the story but doesn't bother to actually track down the truth, expose the lies, and most importantly expose the liars. Doing this costs a lot of money, and takes some time, and these days even the main stream media is all about money, and profits, and so sadly all too often does not investigate such intentional slander. And the intentional slanderers know this.
So far the overwhelming majority of these kinds of slander incidents have come from the zealots on the right. But not exclusively. There have been instances of it coming from the zealots on the left as well. But in recent years, the Bush team has benefited greatly from such slander practices and have as a result said very little against it, while the democratic candidates have tended to renounce it more loudly and quickly when it has occurred supposedly for their benefit.
Keep in mind that this is completely different from a candidate's camp releasing TRUE information about their opposing candidates as a way of cutting into their support. This is something I suspect most candidates will do if they need to, and they have the information to do so. If the information about Barrack Obama had been true, I would suspect that it might have come from Hillary's people. But the fact that it's yet another outrageous lie, aimed at promoting ignorance, prejudice, and even hatred against two democratic candidates, and was released into the public consciousness through notorious muck-raking media outlets, well, it has all the earmarks of the Carl Rove slander machine.
This nonsense didn't come from Hillary. It comes from the same place it's been coming from for over a decade. It's the same fools pushing it, and it'll be the same fools believing it. Fortunately, their numbers are shrinking.