by Xiong Maoling, Sun Ding WASHINGTON, March 10 (Xinhua) -- The 2024 U.S. presidential election has entered a new phase as both U.S. President Joe Biden, the Democratic incumbent, and former President Donald Trump, the presumptive Republican nominee, held campaign rallies in the swing state of Georgia recently to step up their reelection effort. The two launched attacks against each other while having deep political grievances. They also have significant differences in their major policy