Americans' party preferences have fluctuated over the past 15 years, with Democrats enjoying large advantages in Gallup polls in George W. Bush's second term and during the Trump administration while Republicans closed the gap during the Obama years. In the immediate aftermath of the Jan. 6 Capitol riot, the Democrats' lead in party identification grew to 14 points; it receded to 7 points in March.

Source: “Party Affiliation,” Gallup, accessed April 21, 2021, https://tinyurl.com/4yy88e5x

Data for the graphic are as follows:

Time Period Percentage of Republicans/Republican leaners Percentage of Democrats/Democratic leaners
2006 January 6-8 45% 48%
2006 January 9-12 44% 46%
2006 January 20-22 42% 51%
2006 February 6-9 44% 45%
2006 February 9-12 42% 49%
2006 February 28-March 1 41% 50%
2006 March 10-12 41% 52%
2006 March 13-16 38% 48%
2006 April 7-9 41% 53%
2006 April 10-13 39% 50%
2006 April 28-30 40% 54%
2006 May 5-7 38% 49%
2006 May 8-11 40% 48%
2006 May 12-13 39% 48%
2006 June 1-4 43% 50%
2006 June 9-11 42% 50%
2006 June 23-26 38% 55%
2006 July 6-9 40% 49%
2006 July 21-23 39% 49%
2006 July 28-30 40% 52%
2006 August 7-10 39% 51%
2006 August 18-20 43% 48%
2006 September 7-10 40% 51%
2006 September 15-17 42% 50%
2006 October 6-8 37% 56%
2006 October 9-12 38% 48%
2006 October 20-22 39% 54%
2006 November 2-5 39% 49%
2006 November 9-12 34% 56%
2006 December 8-10 40% 50%
2006 December 11-14 40% 53%
2007 January 5-7 40% 53%
2007 January 12-14 41% 53%
2007 January 15-18 38% 52%
2007 February 1-4 37% 54%
2007 February 9-11 40% 52%
2007 March 2-4 39% 52%
2007 March 11-14 41% 48%
2007 March 23-25 41% 51%
2007 April 2-5 42% 49%
2007 April 13-15 42% 52%
2007 May 4-6 41% 49%
2007 May 10-13 39% 52%
2007 June 1-3 42% 48%
2007 June 11-14 37% 53%
2007 July 6-8 37% 53%
2007 July 12-15 40% 49%
2007 August 3-5 40% 48%
2007 August 13-16 41% 47%
2007 September 7-8 38% 52%
2007 September 14-16 39% 54%
2007 October 4-7 40% 48%
2007 October 12-14 39% 52%
2007 November 2-4 38% 54%
2007 November 11-14 35% 49%
2007 November 30-December 2 42% 48%
2007 December 6-9 41% 44%
2007 December 14-16 38% 52%
2008 January 4-6 39% 51%
2008 January 10-13 39% 52%
2008 January 30-February 2 40% 51%
2008 February 8-10 39% 54%
2008 February 11-14 38% 54%
2008 February 21-24 38% 53%
2008 March 6-9 38% 53%
2008 March 14-16 41% 53%
2008 April 6-9 36% 55%
2008 April 18-20 39% 56%
2008 May 1-3 42% 53%
2008 May 8-11 40% 52%
2008 May 30-June1 39% 53%
2008 June 9-12 41% 49%
2008 June 15-19 40% 51%
2008 July 10-13 37% 47%
2008 July 25-27 41% 48%
2008 August 7-10 40% 50%
2008 August 21-23 40% 53%
2008 September 5-7 47% 48%
2008 September 8-11 43% 50%
2008 September 26-27 40% 50%
2008 October 3-5 40% 50%
2008 October 10-12 41% 52%
2008 October 23-26 45% 48%
2008 November 7-9 40% 51%
2008 November 13-16 37% 55%
2008 December 4-7 39% 51%
2008 December 12-14 35% 52%
2009 January 9-11 41% 51%
2009 January 30-February 1 38% 53%
2009 February 9-12 39% 51%
2009 February 20-22 39% 51%
2009 March 5-8 35% 53%
2009 March 27-29 40% 51%
2009 April 6-9 34% 53%
2009 April 20-21 39% 50%
2009 May 7-10 45% 45%
2009 May 29-31 39% 48%
2009 June 14-17 41% 48%
2009 July 10-12 42% 50%
2009 July 17-19 41% 48%
2009 August 6-9 43% 47%
2009 August 31-September 2 43% 49%
2009 September 11-13 43% 47%
2009 October 1-4 43% 46%
2009 October 16-19 41% 47%
2009 December 11-13 43% 49%
2010 January 8-10 43% 48%
2010 February 1-3 45% 46%
2010 March 4-7 44% 45%
2010 March 26-28 46% 46%
2010 April 8-11 42% 46%
2010 May 3-6 45% 44%
2010 May 24-25 43% 48%
2010 June 11-13 42% 47%
2010 July 8-11 41% 46%
2010 July 27-August 1 44% 42%
2010 August 5-8 43% 44%
2010 August 27-30 47% 45%
2010 September 13-16 48% 42%
2010 September 23-26 44% 43%
2010 September 30-October 3 43% 44%
2010 October 7-10 43% 44%
2010 October 14-17 45% 43%
2010 October 21-24 43% 45%
2010 October 28-31 43% 44%
2010 November 4-7 44% 47%
2010 November 19-21 49% 42%
2010 December 10-12 48% 44%
2011 January 7-9 45% 44%
2011 January 14-16 47% 43%
2011 February 2-5 44% 49%
2011 March 3-6 45% 43%
2011 March 25-27 42% 46%
2011 April 7-11 46% 43%
2011 April 20-23 46% 46%
2011 May 5-8 43% 46%
2011 June 9-12 47% 42%
2011 July 7-10 47% 44%
2011 July 12-15 42% 47%
2011 August 4-7 44% 50%
2011 August 11-14 47% 40%
2011 September 8-11 48% 44%
2011 September 15-18 40% 49%
2011 October 6-9 45% 43%
2011 November 3-6 41% 50%
2011 November 28-December 1 43% 43%
2011 December 15-18 45% 45%
2012 January 5-8 44% 47%
2012 February 2-5 44% 45%
2012 February 16-19 45% 45%
2012 March 8-11 41% 46%
2012 April 9-12 43% 47%
2012 May 3-5 41% 47%
2012 May 10-13 45% 46%
2012 June 7-10 42% 44%
2012 July 9-12 41% 46%
2012 July 19-22 47% 45%
2012 August 9-12 41% 44%
2012 August 20-22 46% 49%
2012 September 6-9 42% 51%
2012 September 24-27 43% 50%
2012 November 1-4 42% 50%
2012 November 9-12 40% 50%
2012 November 15-18 39% 50%
2012 November 26-29 44% 46%
2012 December 14-17 41% 49%
2012 December 19-22 36% 53%
2012 December 27-30 39% 47%
2013 January 7-10 40% 49%
2013 February 7-10 42% 48%
2013 March 7-10 41% 48%
2013 April 4-14 40% 49%
2013 May 2-7 41% 48%
2013 June 1-4 43% 46%
2013 June 20-24 43% 46%
2013 July 10-14 40% 46%
2013 August 7-11 41% 44%
2013 September 5-8 41% 47%
2013 October 3-6 38% 48%
2013 November 7-10 39% 45%
2013 December 5-8 42% 44%
2014 January 5-8 40% 45%
2014 February 6-9 40% 47%
2014 March 6-9 42% 47%
2014 April 3-6 41% 43%
2014 April 24-30 41% 48%
2014 May 8-11 40% 47%
2014 June 5-8 44% 44%
2014 July 7-10 40% 42%
2014 August 7-10 42% 46%
2014 September 4-7 47% 42%
2014 September 25-30 44% 48%
2014 October 12-15 47% 41%
2014 October 29-November 2 41% 46%
2014 November 6-9 47% 41%
2014 December 8-11 41% 45%
2015 January 5-8 44% 43%
2015 February 8-11 43% 44%
2015 March 6-9 44% 42%
2015 April 9-12 38% 47%
2015 May 6-10 42% 45%
2015 June 2-7 43% 45%
2015 July 8-12 41% 47%
2015 August 5-9 43% 45%
2015 September 9-13 45% 44%
2015 October 7-11 43% 44%
2015 November 4-8 42% 44%
2015 December 2-6 41% 46%
2016 January 6-10 44% 45%
2016 Jan 21-25 42% 48%
2016 February 3-7 43% 46%
2016 March 2-6 40% 48%
2016 April 6-10 41% 49%
2016 May 4-8 43% 47%
2016 May 18-22 47% 46%
2016 June 1-5 41% 48%
2016 June 14-23 42% 48%
2016 July 13-17 43% 43%
2016 August 3-7 41% 48%
2016 September 7-11 44% 45%
2016 September 14-18 44% 49%
2016 October 5-9 40% 44%
2016 November 1-6 43% 46%
2016 November 9-13 43% 48%
2016 December 7-11 41% 42%
2017 January 4-8 44% 43%
2017 February 1-5 43% 48%
2017 March 1-5 41% 49%
2017 March 9-29 38% 47%
2017 April 5-9 41% 48%
2017 May 3-7 45% 44%
2017 June 7-11 43% 49%
2017 July 5-9 40% 48%
2017 August 2-6 43% 46%
2017 September 6-10 45% 47%
2017 October 5-11 39% 46%
2017 November 2-8 39% 46%
2017 December 4-11 41% 45%
2018 January 2-7 35% 50%
2018 February 1-10 46% 44%
2018 March 1-8 38% 48%
2018 April 2-11 39% 49%
2018 May 1-10 44% 44%
2018 June 1-13 42% 47%
2018 July 1-11 40% 44%
2018 August 1-12 44% 45%
2018 September 4-12 44% 47%
2018 October 1-10 40% 48%
2018 October 15-28 42% 53%
2018 November 1-11 43% 46%
2018 December 3-12 40% 47%
2019 January 2-10 36% 52%
2019 January 21-27 41% 50%
2019 February 1-10 45% 47%
2019 February 12-28 43% 47%
2019 March 1-10 41% 47%
2019 April 1-9 43% 45%
2019 April 17-30 45% 45%
2019 May 1-12 44% 45%
2019 May 15-30 40% 50%
2019 June 3-16 43% 47%
2019 June 19-30 42% 46%
2019 July 1-12 45% 44%
2019 July 15-31 41% 46%
2019 August 1-14 40% 47%
2019 August 15-30 41% 46%
2019 September 3-15 44% 49%
2019 September 16-30 40% 48%
2019 October 1-13 41% 48%
2019 October 14-31 42% 51%
2019 November 1-14 45% 47%
2019 December 2-15 45% 43%
2020 January 2-15 45% 46%
2020 January 16-29 48% 44%
2020 February 3-16 47% 44%
2020 February 17-28 46% 47%
2020 March 2-13 43% 45%
2020 March 13-22 42% 44%
2020 April 1-14 41% 48%
2020 April 14-28 46% 46%
2020 May 1-13 44% 47%
2020 May 28-June 4 38% 50%
2020 June 8-30 39% 50%
2020 July 1-23 41% 47%
2020 July 30-August 12 42% 48%
2020 August 31-September 13 45% 50%
2020 September 14-28 44% 47%
2020 September 30-October 15 42% 50%
2020 October 16-27 45% 49%
2020 November 5-19 45% 48%
2020 December 1-17 39% 50%
2021 January 4-15 37% 51%
2021 January 21-February 2 41% 50%
2021 February 3-18 42% 49%
2021 March 1-15 40% 47%

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