Newly disclosed emails show Michigan Republicans angling to give their party a dominant position through gerrymandered maps and celebrating the plight of their Democratic rivals.

Republicans in the state have denied that they sought partisan gain when they drew new legislative boundaries in 2011. But a federal lawsuit, which argues the maps are unconstitutional, has unearthed records showing Republicans intent on drawing boundaries that would help their party.

The emails, disclosed in a filing on Monday, boast of concentrating “Dem garbage” into four of the five southeast Michigan districts that Democrats now control, and of packing African-Americans into a metropolitan Detroit House district. One email likened a fingerlike extension they created in one Democratic district map to an obscene gesture toward its congressman, Representative Sander M. Levin.

“Perfect. It’s giving the finger to Sandy Levin,” the author of the message wrote. “I love it.”

Excerpts from the emails were filed in United States District Court in Detroit this week as part of a battle between the plaintiffs and the defendant — formally, Michigan’s secretary of state — over how much evidence the sides must disclose before a trial begins. The emails were first reported by The Bridge, a magazine run by the Center for Michigan, a public policy think tank.

Michigan is frequently a battleground state in statewide and national elections, divided evenly between the two major parties. But the Republican Legislature controlled redistricting after population data from the 2010 census became available, and the 14-member House delegation is split lopsidedly between nine Republican seats and five Democratic ones.

Democrats charged at the time that the map was both a partisan and racial gerrymander. Plaintiffs in the lawsuit, led by the League of Women Voters of Michigan, claim Republicans violated the First and Fourteenth Amendments by minimizing Democratic representation for partisan gain.

A party spokeswoman for Michigan Republicans in December dismissed the merit of the lawsuit and said gerrymandering was against the law.

But the email excerpts disclose that Republican drafters wanted to create a map that would give the party 10 House seats and Democrats only four. That would have been too blatant, wrote Robert LaBrant, a Republican strategist, longtime executive at the Michigan Chamber of Commerce and a recognized expert at drawing political maps.

“We needed for legal and PR purposes a good looking map that did not look like an obvious gerrymander,” Mr. LaBrant wrote in May 2011 to Jeff Timmer, a consultant to the drafting process. Contacted by telephone, both men declined to comment because they are likely witnesses in the lawsuit.

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