Trump rally shooting raises concerns of political violence. Here's a look at past attacks against U.S. presidents and candidates.

Contributing sentiments towards policy:

72% : Video captured by CBS News shows Trump touching his ear and then crouching to the ground.
42% : In a social media post shared on Saturday night, Trump thanked law enforcement officials for their quick actions after he was "shot with a bullet that pierced the upper part of my right ear.
29% : That number does not include the latest incident involving Trump.
10% : The Congressional Research Service report says presidents who survived attacks include Gerald R. Ford (twice in 1975), Ronald W. Reagan (a near-fatal shooting in 1981), Bill Clinton (when the White House was fired upon in 1994), and George W. Bush (when an attacker threw a grenade that did not explode towards him and the president of Georgia during an event in Tbilisi in 2005), and the latest Congressional Research Service report, citing Secret Service as source, says also that there have been attempts on former President Barack Obama, Trump and President Biden.

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