Table 2. Effect of treatment and control on voter turnout—Pennsylvania primary.

Group	Control Group	Pledgers	Difference
All individuals contacted	15.7%	15.1%	-0.6%
	(1.4)	(0.1)	p = 0.721
	N = 1,655	N = 4,110
All eligible individuals	34.6%	39.1%	+4.5%
	(3.3)	(2.0)	p = 0.199
	N = 751	N = 1,589
Never voted previously	28.4%	37.2%	+8.8%
	(4.3)	(3.1)	p = 0.057
	N = 457	N = 924

Note: Cluster robust standard errors (in parentheses) adjust for clustering by recruitment shift.