The 4 biggest challenges facing Biden’s reelection bid

President Biden is beset by challenges.

Former President Trump is ahead in many polls following Biden’s widely panned June 27 debate performance in Atlanta. 

Biden’s hold on the Democratic nomination has at times looked shockingly fragile amid criticism from within his own party.

Saturday’s assassination attempt against Trump at a rally in Butler, Pa., appears likely to solidify support for the former president among conservatives.

To be sure, Biden allies...