Rock stars are reacting to the news that President Joe Biden has dropped out of the race for re-election. The 81-year-old President has been under increasing pressure to call off his campaign after a disastrous performance in a debate against Republican nominee and former President Donald Trump last month. Polls show Biden behind Trump in many key battleground states, with voters stating that the President’s age and declining coherence during public appearances has made them less likely to re-elect him. “It has been the greatest honor of my life to serve as your President,” Biden wrote on soci…