WI-Marquette: Trump in the lead

[Pollster]

Very normal to ask half the sample a ballot test question, and perfectly methodologically sound as long as both halves of the sample have been controlled for gender, age, race, etc.

Also, do keep in mind that the Trump campaign has been dumping millions of dollars of online ads on the state of Wisconsin for weeks (months?) now. This is the state that they've chosen to give themselves a head start in.