By Steve Gorman, Daniel Trotta and Nandita Bose

(Reuters) -In the redistricting war being waged across the U.S., voters in California delivered a much-needed win for Democrats by approving a ballot measure that could gain the party five more seats in the U.S. House of Representatives and act as a counterweight to Republican efforts in Texas and elsewhere.

But the political hostilities are far from over and are likely to favor Republicans as more states join the rush to redraw their voting districts midway through the traditional 10-year cycle, creating greater obstacles for Democrats and less competitive races for both parties across the country.

A senior White House official acknowledged that the Democrats’ victory will require the Republicans to respond urgently, with plans under way

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