in a very tight race. >> and it is expected to be very tight. how long might we be waiting for races to be called in pennsylvania? could take a while. >> anderson, it could be a while. pennsylvania didn't even start processing its mail-in ballots, meaning taking them out of the envelope and having to put them through those tabulation machines until 7:00 this morning. historically democrats prefer to vote by mail or vote early. the numbers this year do fit that pattern if you take a look at the pie chart. 69% of pre-election ballots in pennsylvania were cast by democrats. remember, republicans historically favor voting in-person on election day. so those votes will be among the first results we will get tonight and that's why the early map might fill in red and we may then see a blue shift as those mail ballots are counted. this year, by the 63 counties, the majority of this state including philadelphia will do a marathon count going around the clock until every