Trump can't win an election on merit through defending his record. All he can do is fling shit at his opponents and hope some of it sticks.
Starting to think Obama's entry into this was very calculated. If Trump is going after Obama then he's not going after Biden. He seems to face struggles to link the two together so far.
If Biden's campaign keeps churning out those attack ads of just Trump speaking, and can keep Biden away from a microphone for awhile, then they're in a decent spot.
https://youtube.com/v/fYxrhlWzYag