Does it hurt your credit score for mortgage companies to pull your credit?

by eyewash
Question by tonydgr8: Does it hurt your credit score for mortgage companies to pull your credit?
I am trying to purchase a house and I don't have the best credit in the world(to put it mildly!) and I have been paying off some things that are on my credit report, trying to get my score up. Then I was just curious to see if I could get better rates at different companies, so I called around to see what they could do for me. Then when the mortgage guy that I was working with

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