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It has to be a power supply, or horizontal deflection problem. Look at how the width is changing and the raster doesn't even fill the width of the screen in places. The vertical is probably powered from the flyback, so anything wrong with the horizontal deflection can also effect the vertical. I think the vertical problem is just a symptom of a different problem. Does the width problem move slowly up the picture, or is it random? If the distortion is slowly moving, I would suspect that 60Hz is getting into the power supply somewhere (bad filter caps, bad AC rectifier diode,...).
The only possible yoke problem I could see causing that would be a short between the horizontal and vertical windings.
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