Four years ago, almost no one here would have predicted that a State Senator from Illinois would be the frontrunner for the Presidency in 2008 especially after the GOP made major gains in several areas (locally, in Congress, etc.).
By this point in time, Barack Obama had given his convention speech and was widely seen as a future star of the Democratic Party. 2008 looked too soon for him, but he was definitely known as an individual, and not just a state senator.
There are a lot of parallels between '04 and '08, actually. If this election is the wipeout for the Republicans that it looks to be, immediately afterward people will be looking for the rare individuals who shone in the election itself instead of starting completely from scratch. That could have been Sarah Palin, but I think she's tarnished her brand with her interviews. Mike Huckabee, yes.