Before revision:  This decline survives comparisons with 2015 and extensive demographic and spatial controls, and more than doubles in media markets with heavy political advertising . These effects appear asymmetric: while Democratic voters traveled less in 2016  , political differences shortened Thanksgiving dinners more among Republican voters, especially where political advertising was heaviest.
After revision:  This decline survives comparisons with 2015 and extensive demographic and spatial controls, and more than doubles in media markets with heavy political advertising --- an effect not observed in 2015 --- implying a relationship to election-related behavior. Effects appear asymmetric: while Democratic voters traveled less in 2016 , political differences shortened Thanksgiving dinners more among Republican voters, especially where political advertising was heaviest.