Street evangelist and Florida House candidate Joshua Black Tweeted on MLK Day that President Obama should be â€śhangedâ€ť for treason.
"I'm past impeachment," Black posted. "It's time to arrest and hang him high."
Other GOP candidates reacted with shock, according to the Tampa Bay Times.
"You aren't seriously calling for the killing of Obama are you?" Â Chris Latvala, a Republican candidate for another district, replied. "I know you are crazy but good heavens. U R an embarrassment."
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"I make it my business when so called GOP candidates become an embarrassment to my beloved party,â€ť he added.
Black, 31, works as a taxi driver and practices â€śstreet evangelism,â€ť having moved to St. Petersburg, Florida in 2007 â€świth ministry in mind,â€ť according to his website. He got involved in local Republican politics during the 2012 presidential primary.
Black defended his Tweet, claiming that Obama committed treason by ordering a drone strike that killed a U.S. citizen.
"He should be executed for treason," Black said. "I think the appropriate punishment is death. They killed Benedict Arnold. (Obama) shouldn't be allowed to kill Americans without a trial."
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"I guess they're going to call me a racist now," he added. Black is African-American.
On his Facebook, which also contains pro-life and anti-welfare messages, Black wrote: "I make no apologies for saying that the President is not above the People. If ordinary Americans should be executed for treason, so should he."
Blackâ€™s opponent, Democratic state Rep. Dwight Dudley, was alarmed by Blackâ€™s message.
"It's dangerous and unbecoming for someone who wants to lead to call for such violence and extremist action," Dudley said. "Wow. I'm stunned."
Florida blogger and political consultant Peter Schorsch posted the Tweet to his blog, according to CBS, remarking that making a threat to the life of the president is a Class D felony.