Democratic lawmakers, strategists, and activists say the vibe is ‘grim’ as they scramble to bolster President Joe Biden’s chances of obtaining a second term in office, following the attempt on Donald Trump’s life this past weekend. They fear the assassination attempt helped Trump’s chances of winning on Nov. 5 and are trying to rehabilitate the commander-in-chief’s image, which has been in steady decline since the June 27 presidential debate, RadarOnline.com can reveal. An outlet spoke with several people behind the scenes who expressed concern about Biden losing to a man that the Democratic p…