Honestly, looking at the crosstabs, they weren't even trying with this poll. Equal party ID and 54% men. That's right. 2012 exit polls had it at 53% women to 47% men, but the great pollsters at Hampton University have discovered that 14% of Virginia's women have changed sexes in the last 4 years.
While unlikely, it's not out of question:
If males are more motivated to vote this year than women, it could produce an electorate that is overall more male than female.
For example if 51% of the population is female and they only have 55% turnout, while males (49%) have 65% turnout, you could get the electorate that the poll shows.
But yeah, that's still unlikely.