Does Trump lead mean change in race?

In what could signal a shift in the presidential race, Donald Trump leads Hillary Clinton, 45 percent to 42 percent, in a new Fox News national poll.

Trump has trailed Clinton in 39 of 42 previous general-election matchups going back to last November. In March and April, there were a number of polls showing Clinton with a double-digit lead.

In the Fox poll from April, Clinton led Trump 48-41. In a March Fox poll, she led 49-38.

The new poll found that 41 percent of those surveyed have a favorable opinion of Trump, versus 56 percent who have an unfavorable opinion. That's an improvement from the March Fox poll, when Trump had a 31-65 favorable-unfavorable number.

Clinton's favorable-unfavorable figure is 37-61, not much changed from March.