Poll: 2 point difference in PA Senate Race

The Commonwealth Leaders Fund, an independent third party group, released a poll this morning showing the 2018 Pennsylvania Senate race with a 2  point spread to the favor of Senator Bob Casey.
Performed by Commonwealth Leaders Fund, the PA Statewide Benchmark Survey was conducted by IVR Interviews from August 13 -August 15 among a random sample of 2012 likely voters. The poll has a margin error of
plus or minus 3.6 percentage points. Results are weighted. Some percentages in crosstab reports for this poll may not add to 100% due to rounding.
Incumbent Democrat Senator Bob Casey scored  47.09% to Barletta’s 45.22% with the two candidates within the margiin for error.