This year there are presidential elections in both France and the US. The leading party of the opposition is the Republican party in the US and the Socialist party in France.
This year for the first time in France the Socialist candidate was chosen by election, in a quick two-round affair: a one-day vote to wean all but two of the candidates, and a one-day runoff vote one week later.
The Republican primaries in the US are a prolonged game of suspenseful fractional elections, state by state, little by little.
Since the voters of the beginning period are not a random sample of the whole set, their votes are not necessarily representative of the final outcome. Information about voters' intentions is revealed gradually, and late voters can adapt their choice given knowledge of previous voters' choices. They have more information than in France, but that information is not uniformly distributed among voters: early voters have no information. It's like an online algorithm in which votes arrive online and the adversary's choices for the ith vote can depend on votes 1 through i-1. That makes for exciting news!