By: ANDY HUMM | No credible candidate for a major party nomination for president in 2008 supports the right of gay couples to marry and John Edwards, the Democratic nominee for vice president in 2004, is doing his part to keep it that way. At a Portsmouth, New Hampshire event last week, the former U.S. senator from North Carolina, called same-sex marriage the “single hardest social issue for me, personally,” saying that gay couples should be “treated with dignity and respect and should have civil rights.” But Edwards added, “It's a jump for me to get to gay marriage and I haven't gotten across that bridge. But it is something I struggle with, and that's just the truth.”