Filing has closed for the Pennsylvania primaries for all federal and state office this year. Pennsylvania has 203 State House districts. Of those 203 districts, in 103 of them, either no Republican filed to be on the Republican primary, or no Democrat filed in the Democratic primary.
At the April 2008 primaries, primary voters are free to nominate candidates by write-in vote. But no one can be nominated unless he or she receives at least 200 write-in votes. This is difficult, so it is likely that there will be very few, if any, major party nominations filled by write-ins at the primaries.
In 2008, there are 56 districts in which no Republican filed, and 47 districts in which no Democrat filed. By contrast, in 2006, there were 44 State House districts with no Republican on the November ballot, and 29 with no Democrat.