A robust registration push by President Obama’s reelection campaign has resulted in more Democrats than Republicans on the voter rolls in most battleground states, including Florida and Nevada, according to data from state election boards. But Republicans have had their own registration successes, narrowing the Democratic advantage since 2008 in many of the battlegrounds, including Iowa. And party officials say they have put more resources into persuading independent voters who are already registered to cast their ballots for party nominee Mitt Romney.
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