In reality I don't think there is that much difference between Kerry and Bush. I think there is a misjudged perception outside the US that if Kerry gets in world order will suddenly be resumed.
The people who think this, are the same people who think for example it was Bush that scuttled Keyoto, ignoring the fact that while Clinton was President the Senate passed a bi-partisan motion that Keyoto would never be ratified by the US. Clinton signed it, knowing full well it would never be passed, Bush merely acknowledged this and to this day takes the blame.
Kerry won't be ratifying Keyoto either. Get over it.
Kerry...Bush....much of a muchness, so I don't really care. Won't have any noticeable impact. I think either would do a reasonable job. Still, it would be interesting to have a President Hillary Clinton with Bill the first lady. That's only going to happen if Bush wins. 2012 is too long to wait for Hillary. Hillary in 2008!