The following are some of the most popular and useful resources on the web about the US election campaign:

FACTCHECK

politifact.com, a website run by a Florida newspaper, the St. Petersburg Times, and the Congressional Quarterly which fact-checks statements by the candidates using its `Truth-O-Meter.`

factcheck.org, a non-partisan website run by the Annenberg Public Policy Center of the University of Pennsylvania whose mission statement is `Holding Politicians Accountable.`

CAMPAIGN FINANCE

opensecrets.org, a website run by the independent, non-partisan Center for Responsive Politics which tracks money in US politics.

fec.gov, the website of the official Federal Election Commission (FEC), an independent regulatory agency charged with administering and enforcing federal campaign finance laws.

cfinst.org, the website of the Campaign Finance Institute, a non-partisan group affiliated with George Washington University.

VOTING RECORD

thomas.loc.gov, a comprehensive website on legislation in the US Senate and House of Representatives run by the Library of Congress.

opencongress.org, a non-partisan project of the Sunlight Foundation and Participatory Politics Foundation which brings together official government data with news coverage, blog posts and comments.

votesmart.org, a website run by Project Vote Smart which includes biographical information about candidates, their voting records, their positions on the issues, their public statements and campaign financing.

POLLS AND ELECTION TRACKING SITES

realclearpolitics.com, a Chicago-based website founded in 2000 which aggregates polling data, commentary, analysis and election news.

pollster.com, a website launched in 2006 which publishes poll results and commentary that `explains, demystifies and critiques political polling for political insiders and the general public.`

fivethirtyeight.com, a website which collects and analyzes polling data and takes its name from the number of electors in the Electoral College.

There are scores of political blogs but two of the most popular on the right and the left are:

dailykos.com, a Democratic-leaning blog founded in 2002 by Markos Moulitsas Zúniga which received nearly one million unique visitors in September according to comScore figures.

redstate.com, a Republican-leaning blog founded in 2004 by Ben Domenech, Mike Krempasky, and Josh Trevino with a stated `integral role in the right`s fight online against the left.`

INDEPENDENT NEWS SITES

The Huffington Post, a Democratic-leaning blog and news website founded three years ago by Greek-born socialite Arianna Huffington.

Drudgereport.com, a Republican-leading news aggregator website founded by Matthew Drudge.

Politico.com, a political news site launched in January 2007 by former reporters at The Washington Post and Time magazine.

INTERNET POLLS MONITORING

866ourvote.org, a non-partisan Election Protection coalition formed to `ensure that all voters have an equal opportunity to participate in the political process.`

twittervotereport.com, a service of micro-blogging service Twitter where members can send the short messages known as `tweets` about their voting experience or report any problems.

CANDIDATE WEBSITES

barackobama.com, the official website of the Democratic candidate.

johnmccain.com, the official website of the Republican candidate.

MISCELLANEOUS SITES

techpresident.com, a blog co-founded by Andrew Rasiej and Micah Sifry that covers `how the 2008 presidential candidates are using the web, and vice versa, how content generated by voters is affecting the campaign.`