Violence has shuddered through America since Tuesday: First, two controversial shootings by police of African-American men, captured on cameras and spread on social media; then the assassination of at least five Dallas police officers and the wounding of others by a sniper after a peaceful march protesting the earlier deaths.
He called on the nation to "stand in solidarity with law enforcement", saying, "A brutal attack on our police force is an attack on our country, and an attack on our families".
"Too many African-Americans shave been killed in encounters with police over matters that should not have led to that action being taken", she said. The killer was upset, Dallas police said in a Friday morning press conference, over recent police shootings that killed black men, including shootings this week in Louisiana and Minnesota.
"I wanted to see her" said Myiah McClendon, 14, of Detroit Michigan, regarding presidential candidate Hillary Clinton, on Friday at the Riverfront Sports Complex in Scranton.
Hillary Clinton called the deaths of five police officers in Dallas this week "vicious and appalling", adding that there was an "implicit bias" against the black community evident in American society and some police departments that must be addressed. She said Americans need to stand with police officers, regardless of race to end all violence.
He also cited "senseless, tragic deaths of two motorists in Louisiana and Minnesota", a reference to Sterling and Castile, though he did not mention their names. Sixteen percent say they dislike him, while 12 percent describe him as an "idiot" or a "joke" and 10 percent as a "racist" or a "bigot". "The police were moving toward danger" in order to protect the same people who were protesting, she said.
"When an assassin's bullet targeted the police force in Dallas, it touched the soul of the nation", he said.
"Her challenge is to show she can cope with these issues and that she would bring change and would not be the same", said presidential historian Thomas Alan Schwartz.
Presumptive Republican presidential nominee Donald Trump also postponed his campaign appearance scheduled for Friday, a stop in Miami in which he planned to discuss economic opportunity.
Massachusetts Sen. Elizabeth Warren, a favorite among progressives and a potential running mate for Clinton, expressed sorrow for both the civilians and police officers slain this week in a series of tweets. Racial tensions have gotten worse, not better.
President Barack Obama addressed the police shootings from Warsaw, Poland, where he is attending the North Atlantic Treaty Organisation summit.
The best way to honor those who were killed is to work toward improving the criminal justice system, Biden said.
As well as the five police officers killed, another seven were injured. Remember what those officers were doing when they died. The violence broke out as hundreds of people gathered in Dallas to protest this week's fatal police shootings in Baton Rouge, La., and suburban St. Paul, Minn.