Barack Obama and John McCain clashed repeatedly over the causes and cures for the worst economic crisis in 80 years Tuesday night in a debate in which Republican McCain called for a sweeping $300 billion program to shield homeowners from mortgage foreclosure.
In the first presidential race with no incumbent or obvious heir apparent since 1928, many states have scheduled their events much earlier than previously. Keep track of the latest primary and caucus results and schedules for the presidential election. MORE
The Presidential Candidate Tracker introduces each major candidate, explains his or her position on important issues, and highlights the candidate through images, video and audio from the campaign trail. MORE
