It won't be taken seriously with the sarcastic tone.

And when you ask, "Who exactly do you represent?" The answer would be Congressional District 8 (The Fightin' Eighth!), where her opposition to offshore drilling is very popular. By bringing in her constituency, who are pretty much behind her on this, you weaken your argument. It probably would have been more effective to leave that out.

Personally I disagree with you about the drilling, and I'm pretty sure the letter won't be that effective with Pelosi, but I do aplaud your effort to be involved and make your opinion heard. Try writing to your own representative and senators --- they tend to listen more than congressional leaders who are not in you district.

Good on you for the effort.