Dick Morris weighs in:
"The Democratic Party should convert its contests to the winner-take-all format the Republicans largely use. The proportional representation system breeds the same kind of paralysis when used to nominate a candidate as it once caused when the French tried to select a premier during the Fourth Republic."
Over 20 Prime Ministers in 12 years
French Fourth Republic - Wikipedia, the free encyclopedia:
"Although the Fourth Republic oversaw an era of great economic growth in France and the rebuilding of its industry, it is best remembered for its constant political instability and inability to take bold decisions in controversial areas — most notably decolonization."