runner out or safe?

[Dakota]

Originally posted by Woodchuck
In my humble judgement when a foot is on top of a base of plate it is considered part of the base or plate. If runner stepped on catachers foot prior to being tagged, run safe. This is not like football where to body must contact the ground to be ruled down.

Can you back that judgment up with a rule, a POE, a case play, clinic guide or any other authoritative source for softball?

If not, then I go with what the rule clearly says - "touch" the plate. Not touch something else that is touching the plate.