Conservative Sam Rohrer, who served in the Pennsylvania Legislature for 18 years and ran for the Republican nomination for Pennsylvania governor in 2010, plans to announce Monday he will run for a U.S. Senate seat from Pennsylvania in 2012.

The announcement is scheduled for 4 p.m. Monday, Nov. 21, at the Governor's Ballroom of the Radisson Penn Harris in Camp Hill, Pa.

Rohrer, a leader of the state's conservative movement and tireless proponent of the elimination of Pennsylvania's onerous property tax, challenged Tom Corbett in the Republican gubernatorial primary last year.

While Corbett won the nomination and eventually was elected governor, Rohrer made a surprisingly strong showing considering the party establishment (and money) went mostly to Corbett. (Rohrer routed Corbett in Berks County by an 80%-20% margin, and Rohrer beat Corbett in Lancaster County by a 52%-48% margin).

Rohrer, who retired from the Legislature at the end of 2010 to take the post of state director for Americans for Prosperity-Pennsylvania, will run for the Senate seat held by first-term Democrat Bob Casey Jr., one of the most liberal members of the Senate and a close ally of President Obama.

Pennsylvania's other Senate seat is held by conservative Republican Pat Toomey.

For more information on Sam Rohrer and his bid for U.S. Senate in 2012, visit www.RohrerforSenate.org