That is because you are copy/pasting from Word rather than a web-compliant program. If you like Word, try Windows Live Writer; it works exactly the same only you can format your posts exactly for your theme, include images, tags, categories and title and then upload it to your blog with one click. It’s also free.
To get rid of that junk code, you need to click to the TEXT editor on the edit page and then clear out the code you don’t need. Make sure not to take any of the real code you need, like the image code.
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