LIVE Open Thread: GOP Debate Number Four; Trump vs Carson? Jeb vs. Rubio?

The Republican candidates have done their prep, they're in the Badger State and they're ready to take the stage. You can follow the Townhall team's live reaction and analysis to the GOP debate below. We encourage you to join the conversation, especially since our commenting system is back. For instructions about how to sign up, click here.

Here we go, live from Milwaukee....