As millions of immigrants marched across the U.S. in the historic mobilizations for immigration reform in spring 2006, they chanted: "Today We March, Tomorrow We Vote". Skeptics dismissed the marchers, pointing out that neither the undocumented nor legal permanent residents (green card holders) can vote. This report finds that there are 14.25 million potential voters among legal immigrants who are currently eligible to naturalize and the 16-24 year old U.S. born children of immigrants. This includes 12.4 million potential new voters who can be eligible to participate in the 2008 elections. The current Republican-led legislative attacks on immigrants and red-hot anti-immigrant demagoguery sparked the spring 2006 immigrant rights marches and are currently driving record increases in citizenship applications by legal immigrants. They are also likely to drive increases in the registration and voting rates of U.S. born children of immigrants. This could dramatically -- and negatively -- affect the outcome of the 2008 Presidential election for the Republican Party, as well as Republican prospects in numerous state elections.