Frank Newport reviews how New Hampshire could affect Romney's standing in national polls.
Sasha Issenberg reports on how Romney used "big data" in Iowa.
Ron Brownstein reviews Romney's greater appeal to evangelical and Tea Party Republicans in New Hampshire.
Mark Mellman explains the value of Iowa and New Hampshire.
Charles Stewart compares New Hampshire 2008 to 2012, find Romney gained roughly five points in most towns.
John Sides and Lynn Vavreck find that Romney's wealth could be a vulnerability.
Lydia Saad compares the 2012 Republican contest to nomination battles past.
Jeff Jones reviews the history of national primary poll shifts following Iowa and New Hampshire.
Daniel Hopkins marvels at the continuing accuracy of pre-election polls
Harry Enten calculates polling accuracy in New Hampshire
Carl Bialik reviews American's tenuous grasp of the numbers that underlie the policy issues shaping the presidential campaign.
Sean Trende says Obama's Florida numbers should worry him.
Gary Langer sees no number more important to Obama's reelection than the unemployment rate.
Ken Goldstein and Elizabeth Wilner explain their approach to assessing television advertising data.
Glen Bolger, Harrison Hickman, Matt Hogan and Alex Lundry discuss the cell-phone-only problem.
NBC News experiments with polling through Facebook.
Public Opinion Quarterly makes it's 75th Anniversary issue free to all.