While a number of Senate races are close heading into Election Day, the Democrats know it's critical to win the states of North Carolina, New Hampshire, Iowa and Colorado.

Friday, Megyn Kelly will look specifically at that last line of the Democrats' defense, what's moving these races in the final days, and what we might expect from the women and young voters who have been the foundation of the Democrats' firewall in elections past. 

Don't miss "The Kelly File" special, Friday at 9p ET!