English: Number of self-identified Democrats vs. self-identified Republicans, per state, according to Gallup, January-June 2010 http://www.gallup.com/poll/141548/States-Competitive-Terms-Party-Identification.aspx. 18 point Democratic advantage 10-17 point Democratic advantage 3-9 point Democratic advantage 2 point Democratic advantage through 2 point Republican advantage 3-9 point Republican advantage 10-17 point Republican advantage 18+ point Republican advantage (Photo credit: Wikipedia)
Technically, the US is a republic, a representational democracy with protections for minorities. Most people shorten that to a democracy, which is majority rule. Both definitions are true when the Democrats are in the majority. When the Republicans are the majority, the democracy definition still holds true. However, when in the minority, the Republicans still try to rule under the definition of a republic, but they then try to eliminate protections for the majority.