Kentucky Sen. Rand Paul suspended his presidential campaign on February 3, after receiving only 5 percent of the vote during the Iowa caucuses.
Paul entered the 2016 race as one of the most prominent GOP candidates, known for pushing the Republican Party to rethink its approach on foreign policy and racial issues.
The freshman senator favored measures to limit the war on drugs, such as getting rid of most mandatory minimum prison sentences for non-violent drug offenses, and policies that would make it easier for offenders to resettle in their communities after serving their jail sentences. Paul pushed for restoring the voting rights of convicted felons, who are barred in some states from ever voting.
On foreign policy, Paul was more skeptical than most Republicans of intervening in conflicts abroad and had strong reservations about U.S. laws and policies that could expand government surveillance of Americans' phone records and other activities as a way to fight terrorism.
Before the campaign started, there was little evidence that Republican activists agreed with Paul on whether the party needed to rethink its policies. Those fundamental disagreements with the party limited Paul. He struggled in his presidential bid to find support outside of libertarians who supported his father Ron, another perennial president hopeful.
Paul is currently running for his second term as senator of Kentucky.