Krugman on election maths

Paul Krugman writes:

First, at a certain point you have to stop reporting about the race for a party’s nomination as if it’s mainly about narrative and “momentum.” That may be true at an early stage, when candidates are competing for credibility and dollars. Eventually, however, it all becomes a simple, concrete matter of delegate counts.

That’s why Hillary Clinton will be the Democratic nominee; she locked it up over a month ago with her big Mid-Atlantic wins, leaving Bernie Sanders no way to overtake her without gigantic, implausible landslides — winning two-thirds of the vote! — in states with large nonwhite populations, which have supported Mrs. Clinton by huge margins throughout the campaign.

Yep it is Clinton vs Trump.

Second, polls can be really helpful at assessing the state of a race, but only if you fight the temptation to cherry-pick, to only cite polls telling the story you want to hear. Recent hyperventilating over the California primary is a classic example. Most polls show Mrs. Clinton with a solid lead, but one recent poll shows a very close race. So, has her lead “evaporated,” as some reports suggest? Probably not: Another poll, taken at the very same time, showed an 18-point lead.

What the polling experts keep telling us to do is rely on averages of polls rather than highlighting any one poll in particular. This does double duty: it prevents cherry-picking, and it also helps smooth out the random fluctuations that are an inherent part of polling, but can all too easily be mistaken for real movement.

Yep individual polls have a lot of fluctuation and noise. The average is far better to focus on.

Which brings us to the general election. Here’s what you should know, but may not be hearing clearly in the political reporting: Mrs. Clinton is clearly ahead, both in general election polls and in Electoral College projectionsbased on state polls.

It’s true that her lead isn’t as big as it was before Mr. Trump clinched the G.O.P. nomination, largely because Republicans have consolidated around their presumptive nominee, while many Sanders supporters are still balkingat saying that they’ll vote for her.

But that probably won’t last; many Clinton supporters said similar things about Barack Obama in 2008, but eventually rallied around the nominee. So unless Bernie Sanders refuses to concede and insinuates that the nomination was somehow stolen by the candidate who won more votes, Mrs. Clinton is a clear favorite to win the White House.

Clinton is at 66% in the prediction markets. That’s definitely a favourite but far from a certainty.

At the moment Trump looks to have 206 electoral college votes and Clinton 332. That’s the same margin as Obama beat Romney by.