Published Jan 03, 2024 05:03AM ET Updated Jan 03, 2024 05:11AM ET © Reuters. U.S. President Joe Biden speaks to reporters on the one-year anniversary of the January 6, 2021 attack on the Capitol in Washington, U.S., January 6, 2022. Stefani Reynolds/Pool via REUTERS/ File Photo By Jarrett Renshaw (Reuters) - President Joe Biden will observe the third anniversary of the January 6 attacks on the U.S Capitol with a political speech near the historic Revolutionary War site in Valley Forge where he will make the case that his top Republican rival Donald Trump poses an existential threat to democracy,...