Ed Miliband said his wife has "never complained" about his kissing technique after an awkward moment on the party conference stage.
The Labour leader was seen to lean in to embrace Justine as she joined him to take the applause of activists at the end of his keynote speech.
But she moved away, leaving him poised in mid-air in the first of a series of near misses.
Asked on Sky News if it had been a "bad breath problem" or something else, Mr Miliband said: "All I can say is, she's never complained."
Mr Miliband said the "job" of supporting his political career was, rightly, a lower priority for his wife than her own work and being a mother to their two sons.
"She has got her own job, which is as a lawyer. She also helps look after our kids, brings up our kids, that's really important," he told 5 News.
"She's also got a job supporting me. But it's in that order."