Not sure if she's been fully vetted, but she's served a couple terms in the state senate without attracting notoriety. She's a rancher, married with three children.
Hers is not particularly a tea party candidacy. Bruning has been badly beaten up (fairly, to a degree), Stenberg doesn't set the world on fire and has gotten dirty from the mud fight (fairly or unfairly), and Fischer is the classic third candidate with no obvious drawbacks benefitting from the tussle at the top.
She has pulled into a 2% lead with 59% of the vote counted and mostly rural counties left to report.
Given it is Nebraska, I'm guessing every county except Douglas (Omaha) and Lancaster (Lincoln) are considered rural, right?