Joe Biden's initial actions on immigration policy generally fit well with U.S. public opinion.

Biden is only the fourth Catholic major-party presidential nominee in U.S. history, but it's unclear if his religion will be a significant factor in the election.

Research in 2016 demonstrated the power of a single narrative theme -- emails -- in defining Hillary Clinton's candidacy in the minds of voters.

Americans as a whole tilt more negative than positive when asked about "socialism," although understanding of the term varies widely.

While Americans' willingness to support a black or a woman as a candidate for president now approaches 100%, support for candidates who identify as socialist or atheist trails far behind.

While half of Americans view socialism as a bad thing for the country, 43% say it would be a good thing, a much smaller gap than when last measured in 1942.

Less than half of Americans (47%) say they would vote for a qualified presidential candidate who is a socialist -- the same percentage Gallup found in 2015.

As Nigerians prepare to cast their ballots, the country's Muslims and Christians are deeply divided on key issues.

Gallup Editor-in-Chief Mohamed Younis talks about his new role and what to look for in Gallup's research in 2019.

Americans' approval of the Supreme Court, 53%, is the highest since 2009, with improved ratings among Republicans and independents.