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It’s looking grim at Westminster.

Both the major political parties are facing a leadership crisis.

But it’s always darkest before dawn. Doctors used to believe that bit of bloodletting - literally making the patient bleed - was sometimes required to restore them to health.

And so it is in politics. We need change. Labour and the Conservatives are both failing the nation.

The pain they’re going through could be the prelude to a fresh start. Let’s hope so.

The Conservatives are in a battle prompted by David Cameron’s decision to resign.

And it looks like being a particularly nasty one, with Michael Gove, the Justice Secretary, being accused of stabbing his former ally Boris Johnson in the back.

Whatever problems the Tories face are mild compared to the crisis in the Labour Party.

Most Labour MPs are convinced that party leader Jeremy Corbyn must go.

But he seems determined to stay, on the grounds that he won an overwhelming mandate from party members in last year’s leadership contest.

Things are moving quickly, and he may resign after all.

But if not, Labour MPs face the challenge of uniting around an alternative candidate such as former Shadow Business Secretary Angela Eagle, and convincing members to vote for her in a leadership contest.

It’s chaos all over. But look at it this way.

David Cameron’s government was running out of steam. He was a lame duck Prime Minister - after announcing he would resign before 2020 anyway.

And his claim to be a “compassionate” One Nation Conservative was continually undermined by Chancellor George Osborne’s tinkering with the tax and benefits system - which made life harder for the poorest in our society.

Meanwhile, Labour under Jeremy Corbyn was failing to provide meaningful opposition to the Government.

Mr Corbyn’s supporters will point to a number of Government u-turns, such as over tax credit cuts. But these were really a result of Tory MPs rebelling against the Chancellor’s plans, rather than anything Labour did.

Most of all, Mr Corbyn’s Labour Party is not a credible alternative government. It doesn’t look like it could win a general election.

So the current chaos - and the prospect of a change of leadership in both major parties - is a good thing for the country.

It’s needed in order get our political system working again.

Now, if Labour fails to resolve its problems and get a leader that MPs can unite around, that will be a different matter. If Mr Corbyn manages to cling on then Labour as a serious party could be finished.