Good luck trying to get a chargeback on your card if you use it for a donation. When the word "donation" is heard by the rep, they'll end the conversation right there. Donations with credit cards are like Western Union money transfers. Once you pay, the money is gone.
Note that a kickstarter contribution is not a donation, it's a payment for service, and you can certainly ask your credit card company for a chargeback if your backed project doesn't deliver.