A new Fox Business poll of the Wisconsin GOP presidential primary shows Ted Cruz leading Donald Trump 42 percent to 32 percent, with John Kasich in third place at 19 percent. Cruz leads Trump among nearly every demographic group except for independents:

Among just those who say they will "definitely" vote, Cruz's lead over Trump widens to 46-33 percent, and Kasich gets 16 percent. CLICK HERE TO READ THE POLL RESULTS There is a big gender gap. Women back Cruz over Trump by a 19-point margin (46-27 percent). The two candidates are much closer among men: Cruz gets 40 percent to Trump's 35 percent. Cruz's advantage over the real estate mogul also comes from self-described "very" conservative voters, who give him a 36-point lead (61 percent Cruz vs. 25 percent Trump). White evangelical Christians voting in the GOP primary prefer Cruz over Trump by 49-28 percent. Trump has beaten Cruz among this key voting bloc in more than 10 contests so far, according to the Fox News exit poll. Cruz is ahead of Trump among those with a college degree (42-30 percent) as well as those without a degree (44-34 percent). Independents can vote in Wisconsin's open primary -- and are more inclined to back Trump (37 percent) than Cruz (26 percent) or Kasich (26 percent).

A poll by the Marquette University Law School, widely considered the gold standard pollster in Wisconsin, also showed Cruz up 10 points over Trump yesterday. But two other recent polls have shown Cruz leading Trump by just 1 point. Cruz leads Trump by 3.8 points in the RealClearPolitics average of Wisconsin polls.