Guess which of these polls had mobile users in their samples?
If Obama wins big will UK pollsters have to change? The chart is from Nate Silver’s excellent fivethirtyeight.com and shows the Obama leads from the major national White House polls colour-coded according to whether the firms do or do not include cellphone users in their samples. You guessed it – the ones in yellow did while the one in grey restrict their samples to people who could by standard land-lines. There has long been a debate on both sides of…