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Nah, you're probably ok. It's probably noise being injected in from a charger that costs $0.99 to make.
To reassure yourself: First try my UsbMode.apk (in my sig). It will show you touches and you can see if they are jumping all around. You can also go into "Settings > Developer Settings > Show Touches".
Try the Samsung charger plugged in both ways (the AC plug is symmetrical.)
I'd try grounding the ground of the cable, but I don't want to get you into too adventurous territory. If the entire setup is floating it's kind of a gigantic antenna. Plus whatever is coming down your AC line. Plus whatever the switching supply in the charger is generating.
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