Obama campaign officials said Sunday that the bond between President Obama and former President Bill ClintonBill ClintonBoos for Obama as Trump speaks at Boy Scout jamboree Feehery: Winning August OPINION | Dems need a fresh face for 2020: Try Kamala Harris MORE has grown during the 2012 campaign, following a bitter fight between the two camps four years ago.

"Obama has enjoyed the growth in their friendship and relationship," Obama campaign spokeswoman Jen Psaki said in a gaggle Sunday, according to the White House pool report. "They have a really easy rapport with one another and that's been a really enjoyable part of the last couple of weeks.”

Clinton has been one of Obama’s most important surrogates, with a packed schedule in the final days of the campaign. 

Obama and Clinton appeared together at a rally Saturday night in Virginia and again Sunday morning in New Hampshire, where the former president said he preferred Obama as “decider-in-chief” to GOP challenger Mitt Romney.

"The relationship has grown from our view, from the view of President Obama, quite strong,” White House press secretary Jay Carney added to reporters Sunday.

That’s not how the relationship would have been described four years ago, of course, when now-Secretary of State Hillary ClintonHillary Rodham ClintonTrump turns up heat on AG Sessions over recusal Mellman: Trump love? Overnight Cybersecurity: Senate Judiciary reportedly drops Manafort subpoena | Kushner meets with House Intel | House passes Russia sanctions deal | What to watch at 'hacker summer camp' MORE battled Obama in the bitter 2008 Democratic primary.

But during the re-election campaign President Clinton has played a pivotal role, most notably during his lauded convention speech, where he defended Obama’s record and argued that no president could have solved the nation’s fiscal and economic troubles in one term. 

Psaki said that Clinton has done more than 25 events for Obama this campaign cycle.

She said Clinton "has been a tireless — and by tireless I mean he is also losing his voice — advocate on behalf of the president."