there are now 9 announced Republican candidates against Sen. Casey for next year's election. The latest was former Rep. Sam Rohrer, who ran against Corbett for the Governor nomination.
http://articles.philly.com/2011-11-21/news/30425157_1_sam-rohrer-gop-senate-gop-nomination"At least eight other Republicans have announced they are running.
Steve Welch, a Chester County biotech entrepreneur who considered a run for Congress in 2010, is in the race, as are Tom Smith, a former coal-company owner from southwestern Pennsylvania, and Tim Burns, who built a pharmaceutical software company and was the GOP nominee for Congress in the 12th District, centered in Johnstown.
Also running: Marc Scaringi, a Harrisburg-area lawyer and former Senate aide; David Christian, a Bucks County veterans' advocate; Laureen Cummings, a Scranton-area tea-party activist; Bedford County pharmacist John Kensinger; and John Vernon, a retired Army colonel from Tioga County."