MATH was never my strongest subject, so maybe I’m just not crunching the numbers right.

But the more I stare at them, the less sense Marco Rubio makes.

Rubio as the front-runner, I mean. As the probable Republican nominee.

According to odds makers and prediction markets, he’s the best bet. According to many commentators, too.

But Iowa’s less than a month away, and in two recent polls of Republican voters there, he’s a distant third, far behind Donald Trump and Ted Cruz.

So he’s killing it in New Hampshire, right?

Wrong. A survey from two weeks ago had him second to Trump there, but another, just days earlier, put him in third place — after Trump and Cruz, again. Chris Christie’s inching up on him, the reasons for which were abundantly clear in a comparison of Christie’s freewheeling campaign style and Rubio’s hyper-controlled one by The Times’s Michael Barbaro.