I enjoy time-travel stories, so I'm going to answer this purely hypothetically. ie. Assuming time-travel was actually possible, how might time-travellers intervene in history, what might the signs of that be, and do any actual historical incidents match that?

I'm assuming that you are like me, someone that enjoys sci-fi, and is interested in the fun of the question, rather than seriously looking for evidence of time travel having happened.

1) How might time-travellers intervene in history?

Here we encounter a paradox right away, a version of the famous grandfather paradox. Suppose that some disaster had happened, let's say Winston Churchill was killed in a car accident in 1935, and as a result World War II was won by the Nazis.Ok, a time-traveller that's not happy about that goes back and saves Churchill's life. But now the future will be different, and the time traveller wll never have a motive to go back. Paradox!

So what kind of things might a time traveller do that don't get into that paradox? Well one possibility is they might just go back and take part in some great event. They could even participate actively in those events, but only to cause what they already knew to have happened, not to change what to them was the past.

For example, they could go back to the 1930s and encourage Churchill in his warnings about the Nazis. The time traveller wouldn't be so much changing history, as enjoying the ride of being part of those great events.

2) What might the signs of joy riding time travllers be?

What would be some of the clues? One might be that a person seemed to pop into existence out of nowhere, without records of their childhood, early life etc. Just arrive on the scene as an adult.

But maybe a careful time traveller could fake the records. They could go to 1900, and plant a birth certificate. And pop over to 1910 to fake some school records. Then appear in 1935, aged 35, with documentation to prove it. So perhaps it wouldn't look so much like there no evidence at all, but that the evidence about their life story was pretty patchy.

Another sign could be that the time traveller happened to have exceptional foresight or luck. They had the knack of being in the right place at the right time, or making the right calls about things that are hard to predict, of predicting things that no reasonable person would, and then turning out to be right.

3) Do any actual historical incidents match that?

Well, when I think about it Barack Obama's career has shown a great deal of being in the right place at the right time. and making the right calls about things that are hard to predict!

However, his life story seems to be very well documented, and has been examined by every journalist under the sun. So I don't think he can be a time traveller himself.

But, what about some figure close to him that's advised him? The kind of person that'd encourage him to run for the senate, and then as freshman senator run against Hillary Clinton for the Democratic nomination. Who but a time traveller could imagine he'd win that one?

Personally I suspect David Axelrod:

http://cache.boston.com/resize/bonzai-fba/Globe_Photo/2009/02/15/1234756319_8847/539w.jpg

"Every politician has a guardian angel, and every presidential hopeful has a right-hand dispenser of wisdom. ... it is Mr. Axelrod who has been at Mr. Obama’s side the longest and has the most interwoven relationship with him."

http://www.nytimes.com/2008/10/27/us/politics/27axelrod.html?_r=1

Dig deep into his background I say, and you may discover your evidence of time travel! :)

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