Well with THAT many people running, no one is going to hit 50%.
Nightmare scenario is this:
Dem #1 - 12%
Dem #2 - 11%
Rep #1 - 10%
Rep #2 - 10%
Rep #3 - 9%
Everyone else - 49%
The seat goes to the winner of the runoff between Dem #1 and Dem #2, and the GOP loses the seat.