With studies suggesting that long lines at the polls cost Democrats hundreds of thousands of votes in November, party leaders are beginning a push to make voting and voter registration easier, setting up a likely new conflict with Republicans over a deeply polarizing issue. Democrats in the House and Senate have already introduced bills that would require states to provide online voter registration and allow at least 15 days of early voting, among other things. Fourteen states are also considering whether to expand early voting, including the battlegrounds of Florida, Ohio and Virginia, according to FairVote, a nonprofit group that advocates electoral change. Several recent polls and studies suggest that long waiting times in some places depressed turnout in 2012 and that lines were longest in cities, where Democrats outnumber Republicans. In a New York Times/CBS News poll taken shortly after Election Day, 18 percent of Democrats said they waited at least a half-hour to vote, compared with 11 percent of independents and 9 percent of Republicans. A Massachusetts Institute of Technology analysis determined that blacks and Hispanics waited nearly twice as long in line to vote on average than whites. Florida had the nation's longest lines, at 45 minutes, followed by the District of Columbia, Maryland, South Carolina and Virginia, according to Charles Stewart III, the political science professor who conducted the analysis. A separate analysis, by an Ohio State University professor and The Orlando Sentinel, concluded that more than 200,000 voters in Florida "gave up in frustration" without voting.