Op-Ed: Is There Any Danger Of Death Threats On Candidates?

In 2012, Senator Marco Rubio, R-Fla., was the target of a threat deemed credible enough to merit police protection in Washington, D.C., and at his home in West Miami, according to his office and Fox News.

That same year, multiple (mostly right-wing) sources reported that Mitt Romney received death threats on Twitter (though most did not seem serious).

In 2009, the respected British newspaper The Telegraph wrote that President Obama was receiving around 30 death threats a day.

This raises the question:  is it possible – or plausible – that some people may threaten candidates like Ted Cruz, Marco Rubio, or John Kasich, or even Trump to step down?  Will there be immense pressure on them to step down?

Are some supporters getting over-zealous?  What about death threats?  The serious nature of some Republican debates make it seem plausible.  Marco Rubio has already received death threats in his career – could it happen again?