It’s been said that a “week is a lifetime in politics.”

So is a month, or perhaps an hour.

If any of those time measurements amount to a lifetime, how does a year compute?

I pose the question because of what transpired this week at the Conservative Political Action Conference, where Donald J. Trump took the place by storm, prompting rousing applause and cheers, declaring that CPAC finally had one of their own as president.

Do you recall what CPAC speakers were saying a year ago to equally rousing cheers and applause? They were calling Trump a phony conservative. You had the likes of U.S. Sens. Marco Rubio and Ted Cruz talking trash about Trump. The crowd ate it up, swallowed it whole.

Trump then went on to vanquish those two, and a host of other Republicans to take command of the GOP and ultimately to become elected president of the United States.

What gives? How fickle are these CPACers? I believe they’re quite fickle. You see, the president is still the same guy who got the raspberry a year ago.

Trump was supposed to speak to CPAC a year ago. Then he backed out, fearing his immigration policies would provoke disturbances at the conference … or so he said.

CPAC conservatives used to embrace free trade. They used to consider Russia to be a mortal enemy of the United States. They frowned on politicians who led less-than-upstanding personal lives.

Trump — the thrice-married admitted philanderer, free trade foe and supposed pal of Vladimir Putin — gets elected and then stands before CPAC to soak up all the cheers that once went to other Republicans.

What on this ever-lovin’ Earth am I missing?