Mr. President,
I agree that my legislators need to hear from me. Here's a letter I recently sent to my Representative Susan Delbene:

I cannot tell you how upset I am about the coming threat of an Executive Order by President Obama to legalize 5+ million illegal immigrants. This is a usurpation of the legislative powers of Congress. It is a lawless act by a President who seems to believe he has nothing to lose. If this is allowed to happen we will be sliding toward Banana Republic status where laws are ignored and “strong men” do whatever they want.

Do I have to tell you that the legalization of millions of illegal immigrants will result in millions more rushing to come here? And who is to stop them? It’s easy because our executive branch has failed to enforce our border.

Sovereign nations enforce their borders to stop invasions by foreign armies, to prevent invasion by unwanted communicable diseases, to keep agricultural pests and diseases out, to prevent aliens from taking jobs from legal citizens, to prevent illegal drugs from coming in, to stop terrorists from infiltrating in, and other things to protect the citizens and the nation. We have the right to defend our borders. We also have a system for welcoming immigrants to this country. Those who have ignored our immigration laws are as much criminals as those who have broken into our homes and robbed us. Can we not remember that we used to be a nation of laws – not of the desires of one man or one political party.

Comprehensive immigration reform is not popular because there is no trust that the executive branch would actually close the border. So far they have done an ineffectual job and why would that change after a law is passed that provides a path to legality for those who are here illegally?
Do not let the President usurp your power as a legislator. Even if you want reform, you should recognize that once the President has successfully bypassed you on this, what is to stop him from just ignoring Congress all together. That is how it works in Banana Republics. Let’s not go there!

Mr. President, if this letter doesn't meet your approval, tough shit! We conservatives can rag on our representatives too, ya know.