I want to know if it is possible to run a campaign twice for the same product.
With limited information provided here (would need to know more detail truly):
It's actually very common to run a campaign twice if the initial campaign was very successful and demand continues.
More often one repeats because:
1. The first campaign was not successful for a variety of reasons (bad perks/ compensation structures / poor pitch or video assets)
2. The fist campaign was immensely successful and you're releasing a new product based on the success of the first campaign (many for Li's have done this such as Chargetech)
Where I hesitate to say yes, is where the campaign was somewhat successful but not capable of shipping a product (hence you need more capital). You can try, but my sense is that in this scenario you failed to ship/ execute and backers will be wary.