In the political sphere, Domenech, is a supporter of admitting Puerto Rico as the 51st state of the United States. In May 2003 he became President of the Puerto Rico Young Democrats (PRYD). During his tenure as President of the PRYD's, Domenech led a team of 14 young Puerto Rican professionals in Central Florida that campaigned for several weeks for the Kerry/Edwards ticket. He also volunteered extensively during 2003–2004 in former Gov. Pedro Rosselló's gubernatorial campaign, both in island wide political organizing, as well as platform and opposition research activities. In November 2004, Domenech also organized and hosted YDA's Fall National meeting in San Juan, Puerto Rico. Domenech then was elected as a national officer of YDA in 2005 as Vice President for Development and on July 21, 2007 became a member of the DNC, when YDA's national convention elected him as its Democratic National Committeeman. In 2010 he was reelected for his third and last term as YDA's Democratic National Committeeman, before he aged out of the youth organization. During the last years of his active participation in YDA, Domenech was a co-founder of the YDA Hispanic Caucus. Domenech is the only person in the history of the Young Democrats of America to have served as a national officer for seven (7) consecutive years, two (2) years as a Vice President and five years (5) as Democratic National Committeeman.