Let’s count ’em up.

Ohio Gov. John Kasich just joined the Republican Party’s ever-expanding presidential primary field.

He joins Louisiana Gov. Bobby Jindal, New Jersey Gov. Chris Christie, Wisconsin Gov. Scott Walker — am I missing anyone? — as the sitting governors seeking to become the 45th president of the United States.

Of the gaggle of current governors mentioned, only Christie appears to be the target of those who want him to resign while he runs for president. It seems that some in the Garden State don’t think he do both things — run for president and devote enough time to governing the state.

Of course that’s utter nonsense.

But hey, why stop there?

Several Republican U.S.senators are running as well. They include Ted Cruz of Texas, Marco Rubio of Florida and Rand Paul of Kentucky. While I’m at it, let me mention that Sen. Bernie Sanders of Vermont is running for the Democratic presidential nomination. Should they all quit their day jobs while they run for president?

I don’t think so.

I’ve long fired back at critics of presidents — past and present — who gripe about the frequency and length of presidential vacations. I’ve noted that presidents are never off the clock. I will say the same thing about governors and senators.

They’re hooked up continually to whomever and whatever they need in case of emergency.

So, welcome to the field, Gov. Kasich. Good luck trying to be heard over the ruckus created by a certain loudmouth real estate mogul.