For Democrats, anything less than 15 net pickups will be a disappointing outcome [in presidency race].

Hillary Clinton is also not a very exciting, inspiring candidate to a lot of the left-leaning Democratic base, especially in Iowa.

[Hillary] Clinton has also struggled with key groups of voters.

Does Donald Trump accept the results and concede graciously, pursue legal action, or tell his followers to take to the streets?

Ted Cruz is a small-government conservative.

For a long time, many Republicans thought if they just took two aspirin and laid down, [Donald] Trump would go away.

The winner's margin of victory also matters. If it's a squeaker, that will make the lessons learned for both parties much murkier.