Republican and Democratic presidential frontrunners Donald Trump and Hillary Clinton hold leads in nationwide polls amid an escalating feud between the brash billionaire and rival Ted Cruz over their wives.
With the nominating primary and caucus season now past its halfway point, a CNN survey average of six recent polls found Trump holding a 12-point lead over Texas Senator Cruz, 43 percent to 31 percent.
The third Republican in the contest, Ohio Governor John Kasich, was well behind at 19 percent.
On the Democratic side Clinton topped her party rival, Vermont Senator Bernie Sanders, 52 percent to 43 percent.
The average suggests Clinton has expanded her lead since mid-February, when an average of national polls conducted after the New Hampshire primary found Clinton just 6 percentage points ahead of Sanders.
Trump's lead over Cruz is about the same as his lead in mid-February, but both candidates have grown their share of the vote as the field has shrunk. That poll of polls found Trump at 34 percent and Cruz at 21 percent in a field of six candidates.