RENO - More than 700,000 Nevadans cast ballots during early voting in advance of Tuesday's general election, with nearly 50,000 more Democrats than Republicans voting in the battleground state.Fifty-six percent of the state's 1.2 million registered voters took advantage of the two-week window for early voting that ended Friday night, Secretary of State Ross Miller said Saturday.That's up from the 53.7 percent turnout during early voting in the 2008 general election when a total of nearly 650,000 Nevadans cast ballots early, he said."The numbers for early voting are very high," Miller said. "Since I've been in office (2007), the early …