Can you run a raffle online in the US and are there any apps for it?

This was an important Q&A based question about raffling that was recently posted on QUORA:
Can you run a raffle online in the US and are there any apps for it?
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Here is the answer:
www.quora.com/Can-you-run-a-raffle-online-in-the-US-and-are-there-any-apps-for-it/answer/Robert-Pitard-1?prompt_topic_bio=1