There is an account on Twitter that sends out periodic tweets that ask for donations on Twitter. Their profile is called "DonateToObama".
I believe Obama’s campaign takes ownership of the channel when Obama’s own channels retweets their message.
DonateToObama has been spamming twitter multiple times in a day asking for donations: 48 times from July 13-19, including 8 times on July 19.
- Same donation request.
- Same message.
- Multiple times a day.
- Only difference is a different dollar amount and tracking link.
To me, that is spam.