We have a year and seven fretful months before the Democratic Party's national convention decides its nominee for president in July 2020. In the last race, the Republicans fielded 17 major candidates. The smart money was on former Florida governor Jeb Bush. He dropped out in February 2016, too choked up to mention Mr Donald Trump, who emerged as the clear nominee that May. Tricky business, this forecasting, but here's a pick of some air-worthy kites.
The first question, as important as whether candidates have eaten pork belly in Iowa, is how they match up on a debate stage with Mr Trump. The Democrats need someone who can command him to back off, or freeze him with a smile when he repeats the Jaws trick of circling his opponent, as he did with the much shorter Mrs Hillary Clinton while she took her turn.