Dear Mr. Speaker,
I am sorry, but the reality of the numbers simply means that this is the only path for you at this point and the longer you stay in, the better odds are that you allow President Barack Obama to become, despite Michele Bachmann's promises, a TWO term president. Get out while you still can, and endorse Mitt Romney as "conservative enough."
First, let's take a look at your chances of becoming the nominee: National polls have you polling pretty well, but a Romney victory tonight in Nevada seals him as the clear national frontrunner. As for the next few primaries, Romney leads polls (albeit very old polls) in all except for your home state of Georgia. (Congratulations, but that's just not gonna cut it.) Romney is not only better organized, better funded and better known, but also better liked. Delegate counts have you far behind Romney. All signs point to a clear-cut Romney nomination. So thanks for making it interesting, but there's not much more for you to do.
Second, take a long hard look at exactly what you are doing to the Republican party. We get it, you are a true conservative, and you can motivate the base. But it has become very clear that the Republican establishment doesn't like you. Sad but true, they make the real decisions. While you stay in the race, they have to try to beat you, and not Obama. With you still in the race, Obama can sit back and watch you tear into Mitt Romney for being wealthy and successful (which only hurts him among critical swing voters!). While you exist as a challenger, you take money that Romney should be spending on ads against the president. Surely, as a man who plays politics better than most politicians, you can see this.
The only thing that confuses me is where you think your path to victory is.
Take a long hard look at your campaign and decide for yourself what is best. I'm a big fan. But there is little that can be done at this point.
A concerned Republican.