One of U.S. President Joe Biden's key campaign messages, that Donald Trump is a threat to democracy, is winning over fewer Black supporters and those without college degrees than other segments of his political base, a Reuters/Ipsos poll found. Worries about political extremism and threats to democracy have emerged as among Americans' top concerns, following historic events including Republican former President Trump's attempts to overturn his 2020 election defeat, the Supreme Court's move to end the nationwide right to abortion and a surge in migrants crossing the U.S.-Mexico border. Trump has continued to falsely claim that his 2020 defeat was the result of widespread fraud, a view that a majority of Republicans have adopted, and which Biden has warned could corrode voters' faith in the democratic process.