CORRECTION: An earlier version of this gallery incorrectly displayed President James Buchanan, who had served five terms in the House and more than one term in the Senate.
National Journal political forecaster Charlie Cook has called Donald Trump's possible presidential ambitions "a joke."
In contrast to other potential contenders, Trump has never held political office. And to some, his focus on the sensational -- such as questioning President Obama's birthplace -- only underscores his amateur status. Now, Trump has announced that he'll declare his decision on running for the presidency on May 15 -- coincidentally also the date of the finale of his reality show The Celebrity Apprentice.
But historically speaking, lacking of political experience hasn't always led to a laughable candidacy. Let's review some memorable candidates who chose to launch their political careers in the biggest race of them all.