The whole is greater than the sum of its parts... but in a relationship, it's the parts that make a couple tick. That's why we compared the campaigning couples across different criteria on a scale of one to five. Here's a sneak peek at which union is best suited to a White House Stay.
Charisma: Are the compelling to the public?
Stability: How solid is their relationship?
Chemistry: Do they have a palpable romantic spark?
Visibility: Can they keep their political and personal scandals out of the headlines?
Synergy: Is the candidate's spouse a campaign asset or a liability?
JOHN EDWARDS AND ELIZABETH ANANIA EDWARDS
Smart and magnetic, these two are a winning combination. Their family tragedies have left them with an uncontrived bond of love that people admire. This makes them real - an image that no amount of campaign funding can buy. And Elizabeth's resilience is an enormous asset to John.
BARACK OBAMA AND MICHELLE ROBINSON OBAMA
The youngest of the presidential contenders, the Obamas still have to prove that their marriage can stand up to the test of a grueling national campaign. But Michelle's good looks and Barack's star quality make them one of the most intriguing couples of the 2008 campaign.
JOHN MCCAIN AND CINDY HENSLEY MCCAIN
Both have baggage: John is divorced, and Cindy has overcome an addiction to painkillers. Their 18-year age difference once raise eyebrows. But to compensate, they are a faithful- and likable- team. Their adoption of a Bangladeshi orphan gives them diversity cred.
MITT ROMNEY AND ANN DAVIES ROMNEY
Though Mitt and Ann's relationship is rock-solid, Ann isn't well known outside Massachusetts. However, their classic love story adds to their image - although they will have to overcome bias against a Mormon family in the White House.
HILLARY RODHAM CLINTON AND BILL CLINTON
From Monica to Whitewater, the Clintons are hopeless at avoiding the tabloids. But their commitment to their marriage is admirable. Their strong public image stems from their individual personalities - from Bill's charisma to Hillary's resolve - rather than as their chemistry as a couple.
RUDY GIULIANI AND JUDITH STISH NATHAN GIULIANI
Given that each had two previous marriages before this one, Rudy and Judi are not exactly pillars of society (even though they are faithful to each other). Rudy's less-than-likable personality is bolstered by Judi's energy and devotion to her spouse, earning them some credit in the public eye.