In today’s Roll Call, The Winston Group’s David Winston writes about Chuck Schumer and Donald Trump’s recent discounting of polls that are unfavorable to them.

Neither Schumer nor Trump have cornered the market when it comes to the business of discounting unfavorable polls. Trashing polls one doesn’t like and ballyhooing those one does has become a cottage industry in recent years, whether it’s political or policy polling or survey research done by associations, foundations, lobbyists or business. 

For some, it all boils down to this. If the poll is good for your side, it’s a good poll. If it isn’t, it isn’t.

But there are other nuances to survey research worth considering as the polling wars continue. 

Read the full piece here.