前所未有！克林顿、奥巴马、拜登三位美国前总统一同“开炮”特朗普

Group 1 - The core message from former Democratic presidents is a warning about the current state of American democracy, emphasizing the need for citizens to take action against the erosion of norms [1][2] - Obama, Biden, and Clinton have publicly criticized Trump, highlighting their concerns about his impact on democracy and governance [2][3] - The unusual nature of three former presidents openly criticizing a sitting president within a short timeframe is noted, indicating a significant political climate [2][4] Group 2 - Clinton's remarks focus on the divisive nature of current political discourse, suggesting that it threatens the progress of American democracy [2][3] - Biden's comments address the detrimental effects of the current administration's policies on vulnerable populations, particularly regarding social security [1][2] - Obama's call for civic engagement stresses the importance of ordinary citizens standing up against injustices in a democratic society [1][4]