in late 2012, macisaac began a main role on the nbc comedy "1600 penn" as the president's eldest daughter, becca. brittany snow was originally cast as becca but because she did not physically resemble and fit in well with the other family members, martha macisaac was cast. in a 2012 interview with the cbc radio series "island morning", she revealed that "1600 penn" was her last audition before she considered returning to canada.