Table 1. Comparing DLABSS sample demographics to internet and face-to-face samples.

	Internet sample			Face-to-face samples
	DLABSS	MTurk	ANESP	CPS 2012	ANES 2012
Female	57.2% (0.6)	48.0% (1.9)	57.6% (0.9)	51.9% (0.2)	52.0% (0.1)
Education (mean years)	15.1 (0.0)	14.9 (0.1)	16.2 (0.1)	13.4 (0.0)	13.6 (0.1)
Age (mean years)	43.3 (0.2)	37.8 (0.5)	49.7 (0.3)	46.7 (0.1)	47.3 (0.4)
Mean income	$48,203 ($480)	$43,592 ($1,168)	$69,043 ($749)	$61,977 ($138)	$63,199 ($1,274)
Median income	$37,500	$37,500	$67,500	$55,000	$32,500
Race
White	74.4 (0.5)	78.3 (1.6)	83.0 (0.7)	79.5 (0.1)	74.5 (1.0)
Black	6.3 (0.3)	8.4 (1.0)	8.9 (0.7)	12.2 (0.1)	12.2 (0.7)
Hispanic	7.9 (0.3)	7.7 (1.0)	5.0 (0.4)	15.0 (0.1)	10.9 (0.7)
Marital Status
Married	42.5 (1.5)	42.7 (1.0)	56.8 (0.9)	53.8 (0.2)	53.2 (1.1)
Housing status
Own home	51.8 (1.5)	49.5 (1.9)	80.8 (0.8)		71.5 (1.0)
Religion
None	43.9 (1.5)	40.0 (1.8)	13.1 (0.8)		21.3 (0.9)
Protestant	20.0 (1.2)	25.4 (1.6)	38.7 (1.4)		33.3 (1.1)
Catholic	16.8 (1.1)	20.4 (1.5)	22.9 (1.0)		22.7 (0.9)
Region of the US
Northeast	22.8 (0.5)	21.5 (1.6)	16.9 (0.7)	18.2 (0.1)	18.2 (0.8)
Midwest	21.0 (0.5)	25.4 (1.7)	28.3 (0.9)	21.6 (0.1)	22.6 (0.9)
South	31.1 (0.6)	38.2 (1.9)	31.4 (0.9)	37.0 (0.2)	37.2 (1.1)
West	25.2 (0.6)	14.9 (1.4)	23.4 (0.8)	23.2 (0.1)	22.1 (0.9)
Party Identification
Democrat	47.9 (0.6)	44.3 (1.9)
Independent/Other	30.3 (0.5)	30.1 (1.7)
Republican	21.8 (0.5)	22.8 (1.6)
Ideology
Liberal	59.9 (0.5)	62.6 (1.9)
Conservative	32.9 (0.5)	37.4 (1.9)
Registration/turnout
Registered	89.3 (0.9)	91.6 (1.0)	92.0 (0.7)	71.2 (0.1)	72.8 (1.0)
Voted in 2008	80.1 (1.4)	73.8 (1.7)	89.8 (0.5)	61.8* (0.2)	70.2* (1.0)
N	909-8,122	673-705	2,727-3,003	92,311-102,011	2,004-2,054

Standard errors are in parentheses. N is a range because of differing missingness across survey questions.

* indicates turnout in 2012. Political interest is on a 5-point scale with 5 indicating high interest.