Today the big news is Colin Powell's endorsement of Obama on Meet the Press. His endorsement matters, as he is still much resopected in the US, and he of courase was high up in the first Bush Administration.
Its worth noting that Colin Powell lost a great deal of respect internationally on Feb 5th 2003, during his fantasy-fuelled presentation to the UN, trying to convince the international community of WMD in Saddam Hussein's Iraq. Here he is in the photo above with a model vial of anthrax. Here is a link to video of Powell at the UN. [http://uk.youtube.com/watch?v=3ZKoSDazgf4&feature=related]
Why it matters is that Powell will garner positive media attention for Obama in the next 2-3 datys , eating into McCain's window to shake things up.