Comparing candidates is not like comparing apples and oranges. There are distinct differences in candidates' styles, history, knowledge, and skills. Candidates strengths and weaknesses are not a product of their politically parties.
I'm led to these thoughts by newspaper comparisons of the 2004 and the 2008 elections, generally about how various areas of the country went for Bush or for Kerry in 2004. Party affiliation is the wrong measure of future success.
In the 2004 debates, George Bush often came across as folksy and engaged with his audience. John Kerry was often wooden and detached. He also was a bit self-centered. I groaned each time he said, "In my plan" or "I have a plan..."
In 2008, John McCain is exciting people with narrow interests that they perceive he supports, but Barack Obama is exciting people with a larger vision of what our problems are and of where we should be headed.
One might say both the 2004 and the 2008 elections hinged on vision versus me-first.