Bachmann's race tightens

Can anyone explain why the last 100,000 votes for Bachmann & Graves keep coming in at EXACTLY the same rate? They are continually about 1000-2000 votes apart. These seems bizzare. How can the district be that homogeneous?
 
273 of 280 precincts reported.
Republican --- MICHELE BACHMANN == 172513 = 50.45%
Democratic --- JIM GRAVES ======== 168521 = 49.28%
Write-In ----- WRITE-IN ========== 000930 = 00.27%
 
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