A head to head comparison of the Pennsylvania 2018 General Election gives us an idea of the break down of the voters.
Bob Casey received 2.79M (55.74 %) votes, beating Lou Barletta who gained 2.13M (42.62 %) by 657.59k votes in Pennsylvania.
Bob Casey won 15 counties out of the 67 counties that make up Pennsylvania. The record shows that Lou Barletta won 52 counties.
During the 2018 general elections, over 5M total number of votes were cast. Bob Casey got 2,792,437 (3M) over Dale Kerns 50,907 (51k). He won the popular vote by 2,792,437 (3M). His victory in the State of Pennsylvania (with 2,792,437 votes) represents 50.0% of his popular vote victory.
Top 15 Counties in General Elections
All Candidates (Senate General Elections)
These 15 counties play an important role in these Primary elections. If a candidate, can get a sizable majority in the largest counties (Philadelphia, Allegheny and Montgomery), it becomes very difficult to win majorities in the smaller counties without voter outreach and increased voter participation in them.
Top 15 Counties Comparison in General Elections
Philadelphia, Allegheny and Montgomery, three of the larger counties voted in favor of Bob Casey, giving him a 659k vote advantage.