Kasich may get kicked off the ballot in Pennsylvania

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Aside from the desperate attempt to stop Kasich, one legitimate question:

How is it even possible to have around 800 signatures that are potentially fake, out of 2.200 which where submitted ?

In Austria, presidential candidates have to collect 6.000 signatures to be on the ballot and it would be a shocking case if even 3 or 4 turned out to be invalid ...

Fake signatures are quite common in Italy. A couple of regions had to re-vote because of it.