The broad street orange line most southern stops are at the intersection of Broad st and Snyder Ave, Oregon Ave, and Pattison/AT&T Station. All of the stations are within walking distance of the Whitman neighborhood, including Whitman Plaza.
Traveling east and west throughout the numbered streets of Oregon Ave is simple too. Simply wait at a bus stop on any corner of Oregon Ave and wait for the G bus or 7 bus. Either will take you west or east on Oregon Ave. For example, you can take the subway Broad Street line to Oregon Ave and wait for the 7/G bus in front of the subway station. Ride the bus east towards Whitman Plaza on 3rd and Oregon, or a little further towards the South Bowl bowling alley.