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No one won the Republican debate. Now what happens?

We're now in the last stretch before the Iowa caucuses on Feb. 1. Here are the four big storylines to watch that will likely determine the eventual nominee.

Republican U.S. presidential candidates Donald Trump and Chris Christie talk during a commercial break of the Republican presidential debate in Las Vegas, Nev., Dec. 15, 2015. (Photo by Mike Blake/Reuters)
Republican U.S. presidential candidates Donald Trump and Chris Christie talk during a commercial break of the Republican presidential debate in Las Vegas, Nev., Dec. 15, 2015.REUTERS

Benjy Sarlin