6 It is of importance, however, to remark in this place that those who may be placed over the State may in certain cases be chosen by the will and decision of the multitude, without opposition to or impugning of the Catholic doctrine. And by this choice, in truth, the ruler is designated, but the rights of ruling are not thereby conferred. Nor is the authority delegated to him, but the person by whom it is to be exercised is determined upon.
Source: Diuturnum (Vatican.va)