Definition: Given a document, generate a short title of the document. The title should convey the main idea/event/topic about which the document is being written. Note that URLs in the text have been replaced with [Link].
Input: "Slaughtered in school " "And still no gun control " "How come  Marco Rubio?" read three mobile billboards outside  Rubio 's office in Doral  Florida  as CNN reported Friday.
South Florida's mobile billboard campaign trolling of  Rubio  was created by online activist group Avaaz and run through the streets of Miami  according to the report.
"Today citizens are asking: How come  Rubio  refuses to protect our children? The senator has taken fire across the country for his toothless response to the shooting  calling it 'inexplicable.' We called [that] 'inexcusable.'"
 Rubio  released a statement Friday:

NRA