A WEEK ago nobody had ever heard of her.

Today she is the most talked-about woman in the world. And with good reason.

Sarah Palin's sensational performance at the Republican Party Convention may turn out to be the tipping point of this rollercoaster American election.

Obama fans hoping she would fluff her big night were in for a nasty shock.

This speech has turned the election upside down. It was simply stunning.

Democrats and their Lefty media backers had been sneering that she was a small town nobody, a hick from the Alaskan sticks put into a job way beyond an inexperienced woman.

Believe me, you will not be hearing that again.

Palin turned out to be an electrifying mix of intelligence, passion, energy, optimism and plain speaking.

Full of self-assurance and aggression, she popped Barack's balloon big-time.

From the moment she walked on stage in this cavernous bear pit, bandbox smart in cream jacket, trim black skirt and black heels, she proved that John McCain knew exactly what he was doing when he picked her as running mate.

Hair piled into a slight beehive – more Sarah White House than Amy Winehouse – she blinked and smiled behind her geeky spectacles as the vast crowd went ballistic.

For an unpopular party divided over Iraq and struggling to compete with Obama's Messianic glamour, the choice of Palin looks absolutely inspired.

Main Street America will have loved her performance.

And it was seen by 30million voters – the greatest number ever to watch a candidate for the much-derided VP post.

She is popular with voters for the very reason America's snooty political establishment despises her: She isn't one of the Washington gang.

She's a moose-hunting mum of five with a sledge-load of problems behind her own front door that workaday Americans can relate to.

A child with special needs. A daughter of 17 pregnant. A constant juggle between family and career.

As she said, her family has had its ups and downs like any other.

Last night her first task was to introduce herself and her family to an American public incredulous that the unknown Alaska governor could within weeks be a heartbeat away from being their commander in chief.

Compared to the journeyman career politicians dominating both parties here she seemed fresh, natural, one of us and not one of them.

She spoke to America as one mum to another. She cracked good jokes.

What's the difference between a hockey mum and a pit bull?, she asked.

Answer: One wears lipstick.

What will have scared the enemy camp most is the devastating series of prime-time punches she landed on the jutting Obama jaw.

Showing steel beneath her magnolia jacket, she slaughtered his lack of experience, his vanity, his emptiness beneath the windy waffle.

It was the most powerful demolition of the Democrat hero I have heard in two weeks on the US election trail.

The St Paul audience adored her.

When she duffed up the Lefty media commentators for their sexist sneers, the vast crowd roared approval and pointed in anger at the titans of the American press aloof in their special enclosure.

And quite right too: who ever asked whether Obama could still be a good dad if he became president?

The irony, as Palin pointed out, is that liberal media sniping has only succeeded in uniting Republicans behind her.

The wagons have been drawn up and the Republicans are ready for battle.

The McCain-Palin ticket now looks in exciting shape.

A war hero and a heroic mum. Experience and optimism. A man and a woman.

And when McCain joined the Palin gang – babies and boyfriends and all – on stage after her speech there was a sense of cheeky fun absent from last week's solemn Obama coronation.

How the Democrats must be regretting Hillary isn't running with Obama. Barack's sidekick Joe Biden looks a dull old dog compared with the ball of fire that is Palin.

But most fascinating of all, consider this: If Obama loses, Hillary Clinton will run in 2012. Opposing her is sure to be Sarah Palin.

That would guarantee America its first woman president.

And my fistful of dollars, having seen both in action here, would be on Palin