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The boundaries for two dozen districts in the Virginia House of Delegates are pending the outcome of the state’s long-running racial gerrymandering case, a ruling that could delay June’s primaries, again shift about a half-million voters into different districts and force candidates to face new opponents or move.

The U.S. Supreme Court could levy its decision at any time on Republicans’ bid to block the new map and restore the boundaries in effect since 2011.

In the meantime, election officials and candidates across the state are adjusting to the boundaries a lower court established in January, while preparing for the possibility of reverting to the original map.

All of that is happening with Republicans and Democrats in a tight race for control of the General Assembly in the November elections. Republicans hold a two-seat edge in the House and in the Senate. The court-imposed boundaries now in place boost Democrats’ chances in five key House districts.

Election officials across Virginia have spent the past few months notifying just under 411,000 registered voters that their districts have changed. (The estimate of voters was provided by the Virginia Public Access Project.)