Kentucky U.S. Sen. Rand Paul needs to Etch A Sketch his political strategy pronto.

Anyone who thinks that trash-talking your own party will win over voters in a very crowded presidential field needs to be sent packing. Paul has given media interviews saying the GOP brand “sucks.” And in a thinly veiled slap at his fellow Senate Republicans, he has said, “These barnacled enablers have never met a war they didn’t like.”

If that’s not bad enough, he’s now blaming the hawks in his party for ISIS. Never mind 9/11 and all the Democrats who voted for the War in Iraq — including Hillary Clinton — as well as U.S. allies who stood alongside President George W. Bush.

It also ignores the reality that Obama’s misguided withdrawal of U.S. troops in Iraq after the country was stabilized gave ISIS the power vacuum it needed to build and expand its dangerous caliphate.

Are those major fact points mere “details” to the libertarian senator? Or is he just trying to pander to Democrats and independents who may agree with him? If so, it’s a losing campaign strategy, because for every Democrat or independent he may curry favor with, he’ll lose GOP voters he’s now effectively alienated. It’s one step forward, two steps back.

What Paul and his strategists are forgetting is that he first needs to win the GOP primary before he gets to the general. Do you really want to anger your supporters by saying that their party/brand sucks?

Republican voters will have more than a dozen strong candidates to choose from and as such, Paul must compete for every single vote to have any shot at making it to the general. So why insult the GOP and speak so negatively about your party’s image problems — especially when Democrats have plenty of their own?

Let’s look at what Hope and Change has brought us. Iran — the world’s leading sponsor of terrorism — is on its way to getting nukes, which foreign policy experts warn will set off a calamitous arms race in the Middle East and beyond.

Race relations are at their worst point since the Civil Rights movement, and let’s not forget the millions of canceled health plans thanks to the ultimate job-killer — Obamacare.

The surge of ISIS, Boko Haram, al-Qaeda, the Taliban and other radical Islamists continues to threaten America’s way of life and collective safety.

Add it all up and I’d say the Democrats have a few branding problems of their own. If the GOP is competing with Democrats in the branding “wars,” I’d say it’s doing pretty darn well.

Adriana Cohen is co-host of “Boston Herald Drive” on Herald Radio weekdays from 7 to 9 a.m. Follow her on Twitter @AdrianaCohen16.