The strength and diversity of this field bears a close resemblance to Democrats circa 1984 or 1972...
Although it's very possible that neither of those 5 will be the nominee (alot can happen in 2 and a half years), I can imagine alot of moderates just looking at those above candidates and just thinking "...eugh". There's nothing endearing about those candidates, maybe Palin, but imagine her in a general. The only one of the above 5 who I could winning a general election is probably Romney, but I couldn't see him winning a Republican primary.
*This post shall be laughed at in 2012.*