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The lines have been challenged in court, and some in the GOP say they have been targeted by the new map, arguing that Democrats could net five or more seats out of the process. But other Republicans, including those in Washington, don’t seem to be as worried.

“Congressional Republicans pulled out of the attempt to do a referendum on the congressional lines,” said Bruce Cain, a political scientist at the University of California, Berkeley. “That starts to tell you that something fishy is going on here, because if it was such a rape of the Republican Party you wouldn’t expect a division in the ranks. And it’s now becoming clear that there is some sort of factional fighting going on here.”

He said there are a number of districts “where Democratic incumbents are going to have to fight very hard” to keep control, and some of those could tilt toward the GOP.

Among other states, Republicans hope to pick up at least a couple of seats in North Carolina, while in Illinois, Democrats control the entire process and worked to push Republicans out of some seats.

Now, with most maps drawn, Mr. McDonald said, attention switches to the courts, where Democrats are challenging some of the lines.

“Republicans dominated the partisan gerrymandering phase. Now we’re going to see how well the Democrats can beat back the partisan gerrymander,” he said.

Then there are the surprises. Mr. Davis said Democrats may have overreached across the country - and he doesn’t see a big enough wave building to switch control of the House.

“Democrats need 25 seats is the bottom line, and you don’t pick up 25 seats without a wave,” he said. “Right now it’s hard to see a Democratic wave.”

The Rothenberg Political Report shows roughly 80 competitive seats shaping up for next year, compared with 54 that were rated competitive just before the 2002 elections.

House Speaker John A. Boehner, Ohio Republican, said even with redistricting not completed, it’s already clear that a number of vulnerable Republicans had their positions improved in the process.

He said 51 Republican House members sit in districts that Barack Obama won in 2008, and at least half of those now have better districts, thanks to redistricting.

But after suffering historic losses in 2010, Democrats say they can only go up. Rep. Steve Israel, chairman of the Democratic Congressional Campaign Committee, said he already detects “a sustained breeze at our backs.”

Mr. Israel said his party has kept retirements to lower than their average after a power shift in the chamber, and said the anti-incumbent mood will hurt the GOP more than it will hurt Democrats in the House.