ASHLAND, Va. — Glenn Youngkin wants voters in Virginia to hear an urgent message: Your children are in danger. In a speech in Northern Virginia’s suburbs last week, the Republican candidate for governor highlighted the murky case of a student who allegedly committed sex crimes in two area schools. He said the incidents, which have sparked community outrage, are the result of failed Democratic leadership. “What other tragedy awaits Virginia’s children?” Youngkin asked from the podium, flanked by a collection of parents and schoolchildren.  On the eve of the Nov. 2 election, Youngkin’s message represents a new front in his…