Colors

Geneviève Delaisi de Parseval, a French psychanalyst, has written an amusing article (here) on the curious role of distinctive colors in certain political contexts. For example, the abominable American Donald Trump seems to be linked to red, whereas our gentle Frenchman François Fillon is often accompanied by blue. Are such associations (if indeed they are true) purely arbitrary? Or do they convey some kind of hidden meaning?