I can't seem to create a straight line motion path!

I encounter this situation all the time. Whenever I create a motion path straight line, SL automatically creates a vertical path. What I need is a horizontal path. So I edit it but it is never perfectly straight and the motion path results in a choppy looking path. Can someone help? I have attached my file. When I hold down shift or ctrl during the change from vertical to horizontal, SL moves my original graphic in a strange fashion and it still isn't perfectly straight.

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