There is an obvious reason for citizens casting more votes for Republican candidates. Republican voters simply were given more opportunities to vote for their party than Democratic voters.
Of course, some bias exists in the Illinois district map drawn by the Democrats, just as a clear bias also exists in maps drawn in North Carolina, Texas and in other states by Republicans, but that isn't why the Republican voter total was larger in 2022. They just gave their voters more chances to vote for them than the Democrats did.
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