Democrat Joe Sestak has apparently caught up with Republican Pat Toomey in the race to replace outgoing U.S. Senator Arlen Specter. A Muhlenberg College poll released Wednesday shows Sestak ahead by 3 percentage points, 44-to-41, among likely voters.  That’s within the margin of error, which means the race is too close to call.  An earlier Muhlenberg Poll gave Toomey a 7-point lead.  The sampling error margin is plus or minus 5 points.  Sestak is a current congressman in the Seventh District, which is partly in Montgomery County and partly in Delaware County.  Toomey is a former congressman in the 15th District, which is partly in Montgomery County and partly in the Lehigh Valley.