It seems these days that if a Washington marriage is in the headlines, it because a politician has been caught cheating.

John Edwards' affair and separation from his wife, Elizabeth, and the cheating scandals of South Carolina Gov. Mark Sanford and former N.Y. Gov. Elliot Spitzer, had the tabloids churning and Americans wondering what it is that makes a politician stray from his spouse?

But Jill Biden, wife of Vice President Joe Biden, said that political marriages have gotten a bad name recently, and those examples are not indicative of every relationship in Washington.

'People say, you know, 'Oh, everybody cheats in Washington,' and that's not the truth,' she said in an exclusive interview with 'Good Morning America's' Juju Chang. 'You have to have a strong marriage to survive it.

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