A recent study by researchers at the University of Padua and the Max Planck Institute for Demographic Research (MPIDR) has revealed that political differences between partners can significantly increase the risk of separation. Using long-term data from UK couples, the researchers found that those with different party preferences were substantially more likely to separate than those with the same political beliefs. The risk is particularly high when there are differences of opinion on Brexit.
Makes sense. Politics generally derives from basic belief systems and how people think.
Sometimes it goes as deep as value systems.