McGinlehy's voice, his or lip-synced, was an uncanny match for the Red Barber I listened to every Friday morning on NPR while driving to work. I know nothing about the local accent.
stj, I listened to those "Fridays with Red," too. I can only assume that you are not from the South. What McGinlehy did was a weird combination of generic southern with some Brooklyn dipthongs. Here's a video of the Ol' Redhead himself recalling Jackie's entry to the Big Leagues: http://www.youtube.com/watch?v=pJNNH2Rizt8