Former Virginia Sen.
"I understand the odds, particularly in today's political climate where fair debate is so often drowned out by huge sums of money," he wrote on his website.
Webb, who served as secretary of the Navy under
The veteran known for his provocative streak could also put more pressure on Clinton's foreign policy record. In the statement announcing his candidacy, he emphasized his military service and his belief that "there is no greater responsibility for our president than the vital role of commander in chief."
He called the Iraq war, which Clinton supported while a senator herself, "a strategic blunder of historic proportions." He also criticized the Obama administration's conduct during the Arab Spring, including the use of military force in Libya that the GOP has repeatedly tied to Clinton. He insisted that the terrorist attack on a U.S. diplomatic compound in Benghazi, Libya, that killed four Americans was indirectly due in part to the U.S. effort to oust dictator Moammar Kadafi.
"The attack in Benghazi was inevitable in some form or another, as was the continuing chaos and the dissemination of large numbers of weapons from Qaddafi's armories to terrorist units throughout the region," Webb wrote.
Webb, 69, also said he would work to "clean out the manure-filled stables of a political system that has become characterized by greed."