Early and absentee voting is changing the face of elections in the United States. Casting a ballot before Election Day allows campaigns to build advantages – sometimes significant ones. In the Arizona presidential primary Tuesday, the early vote will be pivotal in determining the outcome. Arizona has a very high early and absentee voting rate. In the 2012 Republican presidential primaries, around 75 percent of 505,613overall ballots cast were of this type. Who wins the absentee vote in Arizona has a very high likelihood of winning the state. In the 2016 presidential primaries, as of March 21 (see below for exact dates county by county) 297,714 Democratic and 371,693 Republican voters have already cast ballots in Arizona. This is according to data obtained from NBC’s data partner TargetSmart—a leading voter-file company in the United States. NBC News According the TargetSmart data, 29 percent of registered Democrats and 31 percent of registered Republicans have already cast ballot. Arizona is a closed primary state, meaning that those registered as independent or “other” would need to update their voter registration by February 22, 2016 to be eligible to vote in either the Democratic or Republican primary.