President Joe Biden offered a 100th birthday greeting to former President Jimmy Carter, celebrating a predecessor he said he admires “so darn much.”Calling the former president a “moral force for our nation and the world,” Biden heralded Carter as “a voice of courage, conviction, compassion, and most of all, a beloved friend” in a direct-to-camera birthday greeting shared with CBS News.Carter, who has been in hospice care since February 2023, is the oldest president in American history. The Bidens have remained in close touch with the Carter family.Carter’s grandson, Jason Carter, said at the Democratic National Convention in August that his PawPaw was “holding on” for the November election.“He is hopeful. And though his body may be weak tonight, his spirit is as strong as ever. My grandfather can’t wait to vote for Kamala Harris,” he said.Carter, a Democrat, oversaw key milestones at home and abroad, including the Camp David …