It's extraordinary how hard it is to change the mindset of the public and the press.

emsr2d2

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how = to what extent/degree

Something is extraordinary.
What is extraordinary?
What is extraordinary is how hard it is to change ...

We use "how" this way in certain constructions.

This test is difficult.
I can't believe how difficult this test is.

That sunset was beautiful.
Did you see how beautiful that sunset was?

I worked very hard on that essay.
I hope you noticed how hard I worked on that essay.
 
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