Tonight's republican debate in South Carolina is sure to be interesting, especially for the GOP candidates that have started to pull ahead of the pack.

With just four candidates at this debate, former House Speaker Newt Gingrich, Former Massachusetts Governor Mitt Romney, Former Senator Rick Santorum and Representative Ron Paul of Texas, there will be ample time for each of the choices to state and defend their platforms from each other.

Even so, analysts say the race has already come down to just two of the candidates, Romney and Gingrich.

Political advisers say to clinch the republican nomination Romney must show his presidential strength and toughness in this debate.  To do less than that, they say, will allow Gingrich to shine in a political climate where the republicans are ready to make mincemeat out of Washington.  That's something they say Gingrich's political record shows he can do.