Polls show the pres­i­den­tial race tight­en­ing, includ­ing in key bat­tle­ground states.  So that’s where the pres­i­dent and his Demo­c­ra­t­ic chal­lenger have trav­eled this week.   Wis­con­sin, hit with protests and vio­lence in recent days, got a vis­it from both.   And Trump also head­ed into Joe Biden’s Penn­syl­va­nia, one of the most cru­cial swing states.