Donald Trump has maintained his lead in Republican primary polls since announcing his candidacy in June 2015. There are three theories for his success: 1) He has tapped into widespread populism, nativism, and anti-elite sentiment among Republican voters. 2) His controversial statements have driven massive media coverage, correlating his polling numbers to his outsized media presence. 3) The lack of a consensus alternative among Republican elites has created a power vacuum that Trump has filled. Trump's rise is likely due to an overlap of all three factors.