Republican Senate candidate Dave McCormick stepped up his legal efforts to block the counting of undated mail ballots Friday, as incumbent Democrat Bob Casey came to the defense of four county election boards that defied the Pennsylvania Supreme Court and voted to include them in their final tallies.

This year, the Commonwealth Court has ruled twice that the date requirement, which numerous court proceedings have established serves no purpose, is unconstitutional. The Supreme Court dismissed the first decision on a technicality and blocked the second,