The 2020 election cycle might have already started. The Federal Election Commission shows that 129 people have filed to run for president in the next election.
Annette Elizabeth Allen for NPR
Ohio Gov. John Kasich, shown at a White House event in November, met with GOP members of the Senate Finance Committee last week for a closed-door discussion about the health care law.
Cheriss May/NurPhoto via Getty Images
Vice President Hubert Humphrey (right) and his running mate, Sen. Edmund S. Muskie, wave to the crowd with their wives at the Democratic Convention in Chicago on Aug. 29, 1968. Violence ensued inside and outside the convention hall.
A polling station in Oakmont, Pa., on Nov. 6, 2012. Winning a presidential nomination includes mastering complex rules about delegates, and Pennsylvania's rules are among the most complicated.
Jeff Swensen/Getty Images
Bernie Sanders addresses a rally at Macomb Community College in Warren, Mich. Sanders needs a good showing in Michigan on Tuesday to start to turn his campaign around.
Scott Olson/Getty Images