Deb Fischer, an Unknown, Now Neb. GOP's Senate Nominee

After an improbable Nebraska primary victory, state Sen. Deb Fischer has emerged from relative obscurity to take the mantle as one of the GOP's best hopes for picking up a U.S. Senate seat ? though she'll have to beat a famous Democratic politician to do it ? popular former Sen. Bob Kerrey.

On the presidential front in primaries Tuesday, Republican Mitt Romney continued to pile up the delegates he will need to claim the nomination with wins in two more states, Nebraska and Oregon. But he has already moved into general election mode against President Barack Obama.

Romney began the day 171 delegates short of the 1,144 needed for the nomination and was on pace to get them before the month ended.

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