When Does "Flip-Flopping" Become "Evolving" thinking?

For the record, I am in favor of gay marriage, civil unions, and whatever other kind of relationship two loving human beings wish to conduct.  Furthermore, I strongly favor the idea that gay couples should be able to adopt and raise children.  Moreover, it is none of government's business.  The issue of gay marriage, to me, translates as the late Christopher Hitchens noted--gay marriage does not representI a radicalization of society, rather it is the embourqeoisement of the gay lifestyle. I live in an area where there is a strong concentration of gay people and the area is hardly suffering. 

I am not gay, but if I was, my political instincts would be on high alert when it comes to President Obama.  How is this for conviction:
1996: Obama in favor of gay marriage
1998: Obama uncertain
2004: Obama says he is not a supporter of gay marriage
2006: Obama remains open to the idea
4/2008: Obama says marriage can only be between a man and woman
11/2008:  Obama not in favor
2009:  Obama wants to repeal DOMA
2010:  Obama makes first reference to "evolving" thinking
2012:  Obama says he favors gay marriage, but that the issue should be left up to the states.

Huh? 

If we changed names from Obama to, say some other name, would it be "flip-flopping" or "evolving" thinking?