By Bill O'Reilly

Tomorrow in Mesa, Arizona the four Republican candidates will debate once again, six days before the important primaries in Michigan and Arizona.

In Michigan Rick Santorum has a slight lead over Mitt Romney according to a Rasmussen poll released today. Santorum stands at 38 percent; Romney 34; Paul 10; Newt Gingrich 9 percent. In Arizona the polling is scant but it looks like Romney is running ahead of Santorum, at least according to a Rasmussen survey taken last week.

Now, there is no question that the race is now down to Mitt Romney versus Rick Santorum. But if Newt Gingrich scores big tomorrow night he could come back. However it is Romney who is really feeling the heat. If he does not perform well, he is likely to lose Michigan and perhaps even Arizona. Obviously that would be a disaster for him.

The problem for the Governor is that Santorum and Gingrich might gang up on him tomorrow night. They both need to damage Romney in order to make progress. So the governor will be target number one.

Some Republicans are worried about Rick Santorum securing the nomination. Here is what Donald Trump said on a radio show this week.

(BEGIN VIDEO CLIP):

TRUMP: If you put Santorum in, he has no chance. There is no gift, no Christmas gift that could be given better than Rick Santorum for the Democrats. They are just salivating at that you know. I don't think they believe it's going to happen, but, boy, would they like it to happen because that would be an easy election.

(END VIDEO CLIP)

O'REILLY: Now, Mr. Trump apparently believes that Santorum's social positions are out of the mainstream. We'll deal with that in a moment with Crowley and Colmes.

And there's no question that the senator's straight talk on moral issues has made him a viable candidate for conservative Americans. So it's to Santorum's benefit in the primaries to play the judgmental card. But of course, that will be used against him in the general election.

Finally, according to Rasmussen in head-to-head match-ups President Obama defeats Mitt Romney 45-43. But that's a virtual tie considering the margin of error. And the President beats Rick Santorum 46-44 another tie and a very impressive showing for Senator Santorum.

And that is "The Memo"

Pinheads & Patriots.

In a PBS documentary about Bill Clinton, a very unique unusual piece of tape surfaced, showing a Q&A immediately after Mr. Clinton nominated Ruth Bader Ginsburg to the Supreme Court.

(BEGIN VIDEO CLIP)

BRIT HUME, FOX NEWS ANCHOR: -- your turn, it seems, to Judge Ginsburg may have created an impression, perhaps unfair, of a certain zigzag quality in the decision-making process here. I wonder, sir, if you could kind of walk us through it, perhaps disabuse it and any notion you might have along those lines.

BILL CLINTON, FORMER PRESIDENT OF THE UNITED STATES: I've long since given up the thought that I could disabuse some of you from turning any substantive decision into anything but political process. How you could ask a question like that after the statement she just made is beyond me.

(END VIDEO CLIP)

O'REILLY: That was Brit Hume back in June 1993. He was a patriot then for asking the tough questions, and he is a patriot now.

— You can catch Bill O'Reilly's "Talking Points Memo" and "Pinheads & Patriots" weeknights at 8 and 11 p.m. ET on the Fox News Channel and any time on foxnews.com/oreilly. Send your comments to: oreilly@foxnews.com.