HONOLULU -- Well-wishers from around the world have been sending hundreds of letters and postcards to Hawaii in support of Sen. Barack Obama's grandmother, Madelyn Dunham.

So far, more than 1,000 messages for Dunham have arrived at Obama's Hawaii headquarters with more arriving each day.

The liberal Web site Daily Kos urged Obama supporters to write to Dunham and the Hawaii headquarters agreed to handle the messages.

"It's just been overwhelming. We thought it would maybe be a few dozen cards and we would take them over, but now they are filling the mailbox every single day and they are piling in by the day," Obama's Hawaii Campaign Director Andy Winer said.

Dunham is recovering from a broken hip and suffering from cancer and advanced osteoporosis.

Obama has instructed the Hawaii headquarters to keep track of all the names and addresses of Dunham's well-wishers so he can later send each a thank-you letter.