Democrats should learn from Republican Diversity

Democrats are rightfully credited for supporting diversity in the public square. Generally that refers to gender or racial inclusion. However, I argue vigorously for affirmative action to be extended to all relevant differences we have as people that prevent our country from prospering as well as we might. Whether its' geographic, religious, political ideology, body size/type, etc. many people aren't offered an opportunity to reach their God-Given potential in various areas. We as a country lose in this scenario because of the lost potential to enrich us all through their excellence. So I support Conservatives being hired as Reporters at the NYTimes and Washington Post; as well as people from Idaho and Wyoming given more chances at elite Universities; or an extremely overweight person being elected POTUS. Each person could have unique attributes that could offer breakout success but often in today's world they are left out.

In specific reference to politics, Republicans have achieved a special kind of ideological diversity that should be commended thus far:

they have a social liberal candidate who is conservative in all other areas (Guiliani)
they have a social conservative candidate who is liberal in many other areas (Huckabee)
they have a person who has changed his mind on many issues to fit the party (Romney)

So while the Democrats have racial and gender diversity, we lack a true debate on the issues. Where are the pro-life democrats who might try to win our party's nomination?
What about social conservatives who are against the gay rights agenda and support traditional values but also are economic liberals? What about supply side democrats who believe in tax cuts and smaller government?

On every major issue, all the Democrats running for President generally agree, and argue over small differences in style and political "gotcha" games.

There is a progressive case to be made against abortion, but it has never even been attempted at the national level. Polls show that the Democratic Party is a combination of many groups who don't necessarily agree that much beyond their special interests.

As a party we should make efforts to re-evaluate the coalitions we build for the good of the country.