Four highlights from the fourth Republican presidential debate in Tuscaloosa

Florida Gov. Ron DeSantis and entrepreneur Vivek Ramaswamy from the outset went after Haley, whose poll numbers have been improving after strong performances in the previous debates. She was also endorsed a few days ago by the Koch-funded Americans for Prosperity, and a super PAC supporting her has received big donations from tech and Wall Street financiers. The fourth candidate on stage, former New Jersey Gov. Chris Christie, didn't get a chance to speak for about 15-16 minutes during the spate of attacks on Haley. 

But that soon changed, and Christie used his time to defend Haley against Ramaswamy, whom he deemed "the most obnoxious blowhard in America," and to take his GOP opponents to task for failing to speak out against Trump.

Still the first three debates have not done much to change the dynamics of the race among Republican primary voters. The latest CBS News poll, from early November, showed Trump winning 61% of likely GOP primary voters nationwide, more than all the other candidates combined. DeSantis polled at 18%, Haley at 9%, Ramaswamy at 5%, Sen. Tim Scott at 4% and Christie at 2%. 

Here are the highlights from the fourth Republican presidential debate.

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