Political positions,

method that political scientists use for gauging ideology is to compare the annual ratings by the Americans for Democratic Action (ADA) with the ratings by the American Conservative Union (ACU). Biden has a lifetime liberal 72 percent score from the ADA through 2004, while the ACU awarded Biden a lifetime conservative rating of 13 percent through 2007. Using another metric, Biden has a lifetime average liberal score of 77.5 percent, according to a National Journal analysis that places him ideologically among the center of Senate Democrats. The Almanac of American Politics rates congressional votes as liberal or conservative on the political spectrum, in three policy areas: economic, social, and foreign. For 2005–2006, Biden's average ratings were as follows: the economic rating was 80 percent liberal and 13 percent conservative, the social rating was 78 percent liberal and 18 percent conservative, and the foreign rating was 71 percent liberal and 25 percent conservative. This has not changed much over time; his liberal ratings in the mid-1980s were also in the 70–80 percent range.

Various interest groups have given Biden scores or grades as to how well his votes align with the positions of each group. The American Civil Liberties Union (ACLU) gives him an 86 percent lifetime score, with a 91 percent score for the current session of Congress. Biden received a 91 percent voting record from the National Education Association (NEA) showing a pro-teacher union voting record. Biden opposes drilling for oil in the Arctic National Wildlife Refuge and supports governmental funding to find new energy sources. Biden believes action must be taken on global warming. He co-sponsored the Sense of the Senate resolution calling on the United States to be a part of the United Nations climate negotiations and the Boxer-Sanders Global Warming Pollution Reduction Act, the most stringent climate bill in the United States Senate. Biden cites high health care and energy costs as two major threats to the prosperity of American businesses, and believes that addressing these issues will improve American economic competitiveness. Biden was given a 100 percent approval rating from AFL-CIO indicating a heavily pro-union voting record. Biden is opposed to the privatization of Social Security and was given an 89 percent approval rating from the Alliance for Retired Americans (ARA), an organization of retired union members.


Presidential campaigns
Biden has twice run for the Democratic nomination for President, first in 1988, and again in 2008. He first considered running in 1984, after he gained notice for giving speeches to party audiences that simultaneously scolded and encouraged Democrats. He chose not to run in 1992 in part because he had voted against the resolution authorizing the Gulf War. He considered joining the Democratic field of candidates for the 2004 presidential race but in August 2003 decided otherwise, saying he did not have enough time and any attempt would be too much of a long shot. In May 2004, Biden urged Republican Senator John McCain to run as vice president with presumptive Democratic presidential nominee John Kerry, saying the cross-party ticket would help heal the “vicious rift” in U.S. politics.During this time, Biden was also widely discussed as a possible Secretary of State in a Democratic administration.