Here's Nichols's capsule profile of Tom Clements:
Clements is a native Southerner who worked for thirteen years with Greenpeace International and directed the Nuclear Control Institute before taking over in 2008 as southeastern coordinator for Friends of the Earth. He was a campaign manager to former Georgia Congressman Doug Bernard, an experienced player on the international stage since his days as a leading antiproliferation campaigner and an able spokesman on issues ranging from environmental racism to global warming to the green economy. Clements is economically populist, socially progressive and antiwar. And he knows the race should be about DeMint, not the foibles of his Democratic challenger.
Clements is challenging DeMint to debate him, accusing the incumbent of indifference to his own constituents while meddling in elections across the country. There's no good reason for DeMint to duck him. No one expects Clements to beat him even if Democrats do start following Nichols's advice, while sharing a stage with Clements would elevate the Green party in a way that could prove problematic for Democrats in the future. That might prove problematic for Republicans in the longer term, but it probably wouldn't be DeMint's worry by the time the Greens became the actual second party in South Carolina. Still, that's a result for liberals and progressives in South Carolina to shoot for. Some unions have already endorsed Clements, while greater efforts will probably be necessary to convince blacks to abandon Greene's still-historic candidacy. But if a Green candidate can't come in second against such a hopeless Democrat as Greene, the state party is a hopeless proposition.