A daily roundup of fresh data from scholars, governments, think tanks, pollsters and other social science researchers.

Partisanship demographics, plus more analysis of 2013 roll-call votes, National Journal
How 60,000 bills tried to become law – in one diagram, Sunlight Foundation
The Senate’s class system makes 2014 a tough year f0r Democrats, The Monkey Cage
65% of registered voters support online registration, The Pew Charitable Trusts
Economy and jobs, education, guns are top issues in Colorado, Quinnipiac

U.S. trade deficits widened in December as exports fell, Bureau of Economic Analysis
Employer costs for health benefits rose 3% in 2013, Bureau of Labor Statistics
More than one in six men ages 25 to 54 aren’t working, The Wall Street Journal
Mommy myth: Having kids doesn’t make you less productive, Quartz
Women less likely to earn paid extended leave than men, The Huffington Post
How Twitter’s first earnings report compares to social peers, Bloomberg
Twitter’s earnings report in charts: More money from less-engaged users, Quartz
Ranks of U.S. public companies rising again, The Wall Street Journal
Productivity grows 3.2%; unit labor costs fall 1.6%, Bureau of Labor Statistics
Consumer spending; private fixed investment; oil prices and inflation, Cleveland Fed
Online help-wanted ads dip in January, The Conference Board

Health & Society
Study: Single-sex schools offer little to no advantage, American Psychological Association
New Census tool and tables show county-to-county migration flows, Census Bureau
Mississippi and Alabama most Protestant states in U.S., Gallup
21st-century company towns, Quartz
Humana ACA enrollees younger than expected, Kaiser Health News
Access, affordability and success: How do America’s colleges fare? AEI
Study: Single-sex schools offer little to no advantage, American Psychological Association

The rise and rise of smartphones, The Economist
Altitudes and temperatures of Winter Olympics’ host cities, The Washington Post
Female genital mutilation/cutting data and trends update, Population Reference Bureau
13 facts about divorce in England and Wales, Office for National Statistics
69% of China’s energy in 2011 came from coal, Energy Information Adminstration
More farm-raised fish is in our future, World Bank
World food price index falls despite dairy gains, Food and Agriculture Organization
Employment trends Q2 2013 in selected countries, International Labor Organization

Got new data to share? Send it to us via email facttank@pewresearch.org or Tweet us @FactTank.

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George Gao  is a former associate digital producer at Pew Research Center.