Democrats claim their GOP counterparts are using midterm election wins to enforce changes favorable to Republicans ahead of the 2012 presidential election. They criticize such legislation, saying it could lead to longer lines in Democratic-leaning urban areas and discourage people from voting.

Supporters say bolstering ID rules helps prevent fraud. And at a time when counties face tough budgets, they contend local elections officials don’t have the money to keep early voting locations staffed and opened.

The process of changing voting rules may be nonpartisan on the surface but it is seething with politics just below the surface.

“We’ve had nothing short of a rhetorical firefight for years between the folks who are worried about fraud and folks who are worried about disenfranchisement — a firefight which is pretty much neatly broken down between the two major parties,” said Doug Chapin, an election expert at the University of Minnesota.

While states typically adjust voting rules ahead of presidential elections, this year provides an opportunity for new Republican governors and GOP majorities to legislate on election issues.

Put simply, Chapin said: “What’s happening in 2011 is just as much about what happened in 2010.”

New voting rules recently cleared state legislatures in what have traditionally been presidential battlegrounds, creating partisan rancor.

Plans to reduce the number of days to cast an early ballot cleared the Republican-controlled swing states of Florida, Ohio and Wisconsin. Legislatures in Georgia, Tennessee and West Virginia also lopped off advanced-voting time. North Carolina has a pending proposal. And Maine has done away with a policy that allows people to register at the polls on Election Day before casting ballots.

Each party, when in control, seeks to rewrite the rules to its electoral advantage.