HARRISBURG (AP) – A ballot challenge that could eliminate Gov. Tom Corbett’s only opponent in the GOP primary is slated for a court hearing.Republican Party-backed voters who contested Bob Guzzardi’s petitions will make their case in Commonwealth Court in Harrisburg. Guzzardi, a conservative businessman from Ardmore, has criticized Corbett for breaking the no-new-taxes pledge he made in his 2010 campaign. A central issue in court will be Guzzardi’s failure to file a statement of financial interests with the State Ethics Commission by the March 11 petition-filing deadline. Guzzardi’s lawyer says he filed the statement later and that missing the deadline is a minor violation that should be overlooked. The challengers’ lawyer argues that state law says failing to file it on time is “a fatal defect” for any ballot petition.