Evangelical

I've been trying for a couple of years to get someone to give me a good definition of what an "evangelical" Christian is. I can't as of yet discern whether I am one or not. One friend told me that basically anyone who would fit in with James Dobson's audience could probably consider themselves evangelical. Then again, it seems that many who use this label tend to downplay the importance of baptism and the Lord's Supper, which makes me feel a good bit distanced from the bunch. But I think on social issues I fit in pretty well with them. Is being evangelical more about one's theology or sociology? Can you get more than two or three "evangelicals" to agree on a strict definition of what an "evangelical" is?

So again, how should one define "evangelical"? And if any of you do consider yourselves evangelical, please tell me what it is about you that makes you one.

Just curious.