President Joe Biden is making no excuses for his age in the first campaign ad of a $30 million buy across battleground states after Super Tuesday, casting himself as more effective than his predecessor, Donald TrumpWASHINGTON — President Joe Biden is making no excuses for his age in the first campaign ad of a $30 million buy across battleground states after Super Tuesday, casting himself as more effective than his predecessor, Donald Trump.The 60-second spot opens with Biden, 81, addressing…