In a fast-changing world, a common mistake is to keep fighting the last war.

For example, why would anyone support sending more troops to Afghanistan, when that war was long over? Why would we want to help topple Moammar Gadhafi — after had become an ally in the war on terrorism? Some Republicans seem to support all military deployments just out of habit.

For years after the 9/11 terrorist attack on America, Democrats hysterically bemoaned any military action, especially in Iraq. They claimed to have many precious objections, but the truth was, they thought we deserved the attack — or at best, both sides were at fault.

So when it came to Obama’s pointlessly sending more troops to Afghanistan or foolishly intervening in Libya, some Republicans’ first instinct was to demand muscular American military action, forgetting that we are the party that cares about American national security and does not fling troops around the globe just to look tough, as the Democrats do.

Republicans who supported sending more troops to Afghanistan and taking out Gadhafi were fighting the last war.

Similarly, sometimes it seems as if Republicans’ only move on the economy is to cut taxes. With the highest corporate tax rate in the world, there’s much to be said for cutting taxes. But, unlike when Reagan ran for president, it’s going to take a lot more than tax cuts to rescue this country from its $16 trillion debt.

When Reagan took office, the top marginal tax rate was a staggering 70 percent. Lowering that to 28 percent was an enormous shot in the arm to the economy.

Cutting the top tax rate today from 35 percent to 30 percent — or even 20 percent — cannot possibly have the same dramatic effect. Republicans, as the only responsible party, are going to have to do something that’s never been tried before in Washington: Cut government spending.

To keep prattling about cutting taxes, rather than cutting our behemoth, useless government is fighting the last war.

Finally, some Republicans have been fighting the last war in our primaries.

For at least the last half-century — probably since Abraham Lincoln ran — there has always been a pain in the ass, liberal Republican in the GOP primary race. (You always can tell who the liberal is – it’s the one The New York Times calls “pragmatic” and “moderate.”)

In 1968, there were two liberals — Richard Nixon and Nelson Rockefeller — and one conservative, Ronald Reagan, who nearly won the nomination.

In 1976, it was Reagan again, vs. Gerald Ford (“moderate”). In 1980, it was Reagan a third time, vs. pro-choice, “voodoo economics” George H.W. Bush.

In 1992, it was Pat Buchanan, the conservative, against “Read My Lips” betrayer Bush. In 1996, it was, again, Buchanan against moderate Bob Dole (“tax collector for the welfare state” in the immortal words of Newt Gingrich).

In 2000, we had conservative-enough George W. Bush against liberal John McCain. In 2008, it was liberal McCain vs. Mitt Romney, the conservative.

You will note that liberal Republicans have always stayed liberal Republicans and conservative Republicans have always stayed conservative Republicans. Only their match-ups change.

Until this year.

For the first time, the last cycle’s conservative has been rebranded a “liberal” by right-wingers eager to resume their battle against liberal Republicans. This year’s actual liberal Republican, much admired by the Non-Fox Media, was Jon Huntsman. But he dropped out after the New Hampshire primary.

Mitt Romney isn’t a liberal. He isn’t even a moderate. And he certainly isn’t liked by the Times.

Liberals so loathe Romney that in 2008, their most Christian-phobic columnist, Frank Rich, was forced to write admiringly about pro-life Christian Mike Huckabee. He may have been a Christian, but at least he wasn’t Mitt Romney!

Conservatives know perfectly well Romney isn’t a “moderate” — he was our conservative hero just four years ago!

Indeed, when Romney withdrew from the 2008 primary at CPAC that year, gallantly throwing his support to the front-runner, McCain, a college-age Christian standing next to a friend of mine expressed the general sentiment of the 10,000 assembled right-wingers by saying, “This f-ing blows.”

But the need to revert to comfortable old roles has forced some right-wingers to designate our 2008 hero as the Rockefeller Republican this time around.

It has nothing to do with the facts. Conservatives who attack Romney as the “establishment Republican” are behaving like Democrats, giving us epithets in lieu of facts.

Perhaps it is because they were asleep at the wheel four years ago when Republicans actually did run a liberal for president that these conservatives feel the need to create an imaginary liberal Republican to oppose ferociously this time.

John McCain was worshipped by the liberal media, was the author of the unconstitutional campaign finance law as well as a global warming bill, adamantly supported amnesty for illegal aliens, opposed the Bush tax cuts as “tax cuts for the rich,” wanted to shut down Guantanamo, called waterboarding “torture” and viciously attacked Jerry Falwell and Pat Robertson as “agents of intolerance” (then immediately faxed that speech to The New York Times).

And he was from a conservative state! Where were you people four years ago he got the nomination?

By contrast, when Romney was governor of Massachusetts, every single budget he submitted to the 85 percent Democratic legislature included tax cuts. He became a pro-lifer when it mattered — while he was governor — and vetoed a stem cell research bill. He slashed government spending in one of the most liberal states of the union. He is the rare elected Republican who is tough on illegal immigration. He has forcefully denounced Obama’s dangerous foreign policy.

But the facts are irrelevant to people busy fighting the last war. It’s not about Romney at all, but their own posing. Romney is the Emmanuel Goldstein of GOP primary voters looking for a moderate to hate because they fell down on the job last time.

Liberal Republicans always lose. Because he is not a liberal, Romney stands a good chance of beating Obama this fall. But if the fantasist posers keep turning this presidential race into their personal “Dungeons and Dragons” battle against “moderates,” Romney’s victory will go into the “Liberal Wins” column, when it is anything but.

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