Sen. Dick Lugar to learn his fate in Indiana; N.C. votes on marriage amendment

Walker is expected to easily win the GOP nomination, while the outcome of the Democratic primary is less certain. Milwaukee mayor Tom Barrett, the party's 2010 gubernatorial nominee, faces a strong challenge from former county executive Kathleen Falk. Additional Democrats are running for the nomination.

The winner will challenge Walker in a pivotal June 5 election that has garnered involvement from conservatives such as New Jersey Gov. Chris Christie, tea party members, and well as labor activists across the country.

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