[GoMonster]

it is 44 to 43. Challenger usually get majority of undecides at the end. I will bet you even money on Thune in South Dakota especially with stuff going on in New Jersey.

[BlackRazor]

it is 44 to 43. Challenger usually get majority of undecides at the end.

Normally that is the case, but what about an instance when both candidates are already state-wide incumbents? That is the case in South Dakota. Thune is the state's lone House representative. Because of that, I don't think you'll get the normal undecided vote breaking against the incumbent. This is essentially an incumbent vs. incumbent match-up.