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Professor David Guth has been placed on leave because of a tweet he published after this week's mass shooting in Washington, the University of Kansas said Friday, Sept. 20, 2013. Guth tweeted "blood is on the hands of the #NRA. Next time, let it be YOUR sons and daughters." (AP Photo/University of Kansas, Chuck France)

Professor David Guth has been placed on leave because of a tweet he published after this week's mass shooting in Washington, the University of Kansas said Friday, Sept. 20, 2013. Guth tweeted "blood is on the hands of the #NRA. Next time, let it be YOUR sons and daughters." (AP Photo/University of Kansas, Chuck France)

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LeBron James' 'I can't breathe' T-shirt the latest display of politics on the playing field

Cleveland Cavaliers superstar LeBron James on Monday night during pregame warmups wore an “I can’t breathe” T-shirt, referring to Eric Garner, who died after a New York police officer placed him in a chokehold during an arrest for selling loose cigarettes. The shirt, one of several featuring the slogan that have been seen around the league in recent days after a grand jury declined to indict the officer last week, is just one in a long history of political statements made by athletes on the playing field. Here are some others.