See Smart Voter archived elections for ballot lists, results, and campaign promises:

Year Election Date Scope of Coverage
2014 Aug 12 CA: Los Angeles County special election
  July 8 CA: Santa Barbara County special election
  June 3 CA: California State Primary including local elections
  May 20 PA: Pennsylvania State Primary
  May 6 CA: Special elections for Alameda, Contra Costa, Marin, and Santa Clara counties
  April 8 CA: Municipal elections for Los Angeles, Marin, and Mendocino counties
  Mar 25 CA: Special election for State Senate District 23 (Los Angeles, Riverside, San Bernardino)
  Mar 4 CA: Special elections for Los Angeles county
  Feb 11 CA: Special election for San Diego county
  Feb 4 CA: Special election for Alameda county (Piedmont)
2013 Dec 3 CA: Special elections for Los Angeles county
  Nov 19 CA: Local elections for Los Angeles, San Diego, Sonoma, and Ventura counties
  Nov 5 CA, OH, PA: Local elections for California, Hamilton County, Ohio, and Pennsylvania
  Sept 24 CA: Special election for Los Angeles and San Bernardino counties
  Sept 17 CA: Special elections for Los Angeles and Ventura counties
  Sep 10 OH: Special election in Hamilton County
  Aug 27 CA: Special elections in Santa Clara, Marin, and Mendocino counties
  Aug 6 OH: Special election in Hamilton County
  Jul 30 CA: Special election in Santa Clara County (County Supv D2)
  Jul 23 CA: Special elections in Los Angeles and San Bernardino counties (Runoff & AD 52)
  Jun 18 CA: Special election in San Luis Obispo County (City Council)
  Jun 4 CA: Special elections in Contra Costa, Los Angeles, Santa Clara, Santa Cruz counties
  May 21 CA: Runoff and special elections in Los Angeles, San Diego counties
PA: State judicial and local primary elections in Allegheny, Chester, Delaware, Montgomery, and Philadelphia counties
  May 14 CA: Regular election in Los Angeles County (Redondo Beach) and State Senate D32 runoff.
  May 7 CA: Special elections in Alameda, Mendocino, San Mateo, Santa Clara, and Santa Cruz counties
OH: Local primary election in Hamilton County
  Apr 9 CA: Special elections in Los Angeles and San Mateo counties
  Apr 2 CA: Regular election in Los Angeles County (Glendale, Inglewood)
  Mar 26 CA: Special election in San Diego
  Mar 12 CA: Special elections for State Senate Districts 32 and 40
  Mar 5 CA: Regular municipal/school elections Los Angeles County. Special election in Alameda County
  Feb 26 CA: Special election in Los Angeles County (Burbank)
  Jan 9 CA: Sacramento County: Special appointment for Elk Grove
  Jan 8 CA: State Senate District 4 special runoff
2012 Nov 6

CA: Presidential General for California. Beta Version with New Features
OH: Presidential General for Ohio
PA: Presidential General for Pennsylvania. Voter ID Info

  June 5 CA: State Primary
  May 8 CA: Contra Costa, Santa Clara, San Mateo counties special
  Apr 24 PA: State Primary
  Apr 10 CA: Los Angeles, Mendocino, San Mateo, Sonoma counties
  Apr 6 CA: Contra Costa County special
  Mar 13 CA: Los Angeles County special (Arcadia)
  Mar 6 OH: State Primary
CA: Mendocino (Fort Bragg)
  Feb 7 CA: Alameda County (City of Piedmont)
  Jan 17 CA: Los Angeles County (Los Angeles Council District 15)
2011 Nov 22 CA: Los Angeles County (City of Vernon)
  Nov 15 CA: Alameda, Contra Costa counties special elections
  Nov 8 CA: Local elections
OH: Hamilton County
PA: State and local elections
  Aug 30 CA: San Luis Obispo
  July 12 CA: Los Angeles. Runoff for Congressional District 36
 June 7 CA: Butte, Contra Costa
  May 17 CA: Los Angeles (runoff from 3/8 election and Special Primary for 36th Congressional District)
NY: Westchester County
PA: State Primary. Local elections in Allegheny, Delaware, and Montgomery counties
  May 3 CA: Alameda, Contra Costa, San Mateo, Santa Clara, Santa Cruz, Assembly District 4 (Alpine, El Dorado, Placer, Sacramento)
OH: Hamilton County
  Apr 19 CA: Los Angeles (Pasadena, Compton)
  Apr 12 CA: Los Angeles (Burbank, Monrovia)
  Apr 5 CA: Los Angeles (Glendale, Inglewood)
  Mar 22 CA: Los Angeles (Inglewood)
  Mar 15 NY: Westchester County village elections
  Mar 8 CA: Alameda, El Dorado, Los Angeles, Orange, San Mateo, Santa Clara , State Assembly District 4
  Mar 1 CA: Los Angeles
  Feb 15 CA: Senate Districts 17 and 28
  Jan 25 CA: Special elections for Los Angeles (Azusa)
  Jan 11 CA: Special election for Los Angeles (Inglewood)
  Jan 4 CA: Special election for Senate District 1
2010 Nov 2 General statewide elections in California, New York, Ohio, and Pennsylvania
  Sept 14 NY: New York State Primary Election (including Westchester County)
  Aug 31 CA: Los Angeles County Vernon, Inglewood special elections
  Aug 17 CA: State Senate District 15 special runoff
  July 13 CA: Santa Barbara County Montecito Fire District special election
  June 22 CA: Alameda County and State Senate District 15 special primary
  June 15 NY: Westchester County special election
  June 8 CA: California State Primary including local elections
  May 18 PA: Pennsylvania State Primary,
NY: Westchester County 40 school districts
  May 4 CA: Contra Costa, Los Angeles, San Mateo, and Santa Clara, Santa Cruz counties, special elections.
OH: Ohio State Primary, plus local in Hamilton County
  Apr 13 CA: Los Angeles County local elections
  Mar 16 NY: Westchester County village elections
  Mar 2 CA: San Mateo County special election
  Feb 23 CA: Los Angeles, San Mateo counties, special elections
  Feb 2 CA: Alameda County, local election
  Jan 12 CA: Orange County, AD 72 runoff election
2009 Dec 8 CA: Los Angeles County, special election
  Nov 17 CA: Orange and Sonoma counties, special elections
  Nov 3 Local Elections in California, New York (incl. Westchester County), Ohio (incl. Hamilton County) and Pennsylvania
  Sept 29 PA: Montgomery County special election
  Sept 22 CA: Los Angeles County
  Sept 15 NY: Westchester County, special.
  Sept 1 CA: Congr. District 10 (Alameda, Contra Costa, Sacramento, Solano) and Assem. District 51 (Los Angeles)
  August 25 CA: Contra Costa County special
  August 4 OH: Hamilton County special
  July 21 CA: Alameda County, special
  July 14 CA: Los Angeles County, special
  June 30 CA: Los Angeles County, special
  June 23 CA: Los Angeles County, special
  June 16 CA: Local elections in Los Angeles
  June 9 CA: Local elections in Los Angeles
  June 2 CA: Local elections in Alameda, Los Angeles, Marin, San Mateo counties
  May 19 Statewide elections in California and Pennsylvania including some local counties.
NY: Local elections in Westchester County
  May 5

CA: Contra Costa, El Dorado, Los Angeles, San Mateo, Santa Clara, special.
OH:
Hamilton County special

  Apr 21 CA: Los Angeles, local elections
  Apr 14 CA: Los Angeles, local
  Apr 7 CA: Los Angeles, special
MO: St. Louis City and St. Louis County local
  Mar 24 CA: Los Angeles, special
  Mar 18 NY: Westchester, local
  Mar 10 CA: Los Angeles, local
  Mar 3 CA: Contra Costa, Fresno, Los Angeles, Marin, Monterey, San Joaquin, Santa Clara, Sonoma local elections.
MO: St. Louis
  Feb 24 CA: Los Angeles, special
  Feb 3 OH: Hamilton Co., local election

For older elections back to 1997, see Archives of Past Elections.

See also the "History of Smart Voter".