He also had to deal with a less weighty, but stubbornly persistent problem that has dogged him throughout his second term: the scourge of the selfie.
One of the most stubbornly persistent problems is roadside checkpoints, which cause delays and attract policemen demanding bribes.Citadel Capital, a Cairo-based private-equity firm, has an ambitious plan to create transport links away from Africa's roads.
Plato's position on this question is a stubbornly persistent ideal, despite the equally stubborn persistence of criticism.
Tuberculosis remains a stubbornly persistent killer in Africa, Asia, and South America, striking about nine million people a year.
Today's racial divide is more subtle, but it remains a stubbornly persistent blend of remoteness, distrust and economic inequality.
The sad fact is that his latest article fits the pattern of a stubbornly persistent social belief.
Afghanistan's situation – a stubbornly persistent Taliban, buoyant opium production, rife corruption and a widespread insurgency – were all foreseeable at the time of the 2002 invasion but the problems were not foreseen in a way that enabled them to be understood, planned for and acted upon.
If it did, then Europe as a whole would not have seen a stubbornly persistent rise of radical right politics over a 30-year period.
People like us, who believe in physics, know that the distinction between past, present, and future is only a stubbornly persistent illusion".
And Internet banks have discovered that customers have a stubbornly persistent preference for buying long-term savings products face-to-face.
As Einstein once wrote, "People like us, who believe in physics, know the distinction between the past, present and future is only a stubbornly persistent illusion".
