In In re Nomination Paper of Rogers, 908 A.2d 942 (Pa. Cmwlth. 2006) (one-Judge decision), President Judge Colins repeated the rule that an objector bears the burden of proving the invalidity of each individual line challenged and rejected as immaterial allegations by the objectors of patterns of fraud in the collection of signatures. Impeachment of witnesses through evidence of prior misconduct is prohibited under Pa. R.E. 608(b)(1), and questioning of circulators' conduct and their affidavits would be irrelevant where only two global challenges related to circulators' signatures and all others related to the residence of the circulator or the lack of notarization.