As of my last knowledge update in October 2023, here are the major ruling parties and their presidential candidates in Nigeria's democratic history since the transition to civilian rule in 1999:
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1999 Elections:
- Party: People's Democratic Party (PDP)
- Candidate: Olusegun Obasanjo
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2003 Elections:
- Party: People's Democratic Party (PDP)
- Candidate: Olusegun Obasanjo (re-elected)
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2007 Elections:
- Party: People's Democratic Party (PDP)
- Candidate: Umaru Musa Yar'Adua
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2011 Elections:
- Party: People's Democratic Party (PDP)
- Candidate: Goodluck Jonathan
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2015 Elections:
- Party: All Progressives Congress (APC)
- Candidate: Muhammadu Buhari
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2019 Elections:
- Party: All Progressives Congress (APC)
- Candidate: Muhammadu Buhari (re-elected)
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2023 Elections:
- Party: All Progressives Congress (APC)
- Candidate: Bola Ahmed Tinubu
The above parties and candidates reflect the major political shifts in Nigeria's democracy. The PDP was the ruling party for a long time until the emergence of the APC in 2015. Following the 2023 elections, Bola Ahmed Tinubu of the APC is the current president of Nigeria.