Racist voters may have cost Donald Trump at least two delegates in Illinois.

The state uses a complicated system to choose its delegates, who are awarded when voters select a candidate and then choose delegates representing them on the ballot.

Trump won the Illinois GOP primary, but rivals Ted Cruz and John Kasich picked up a couple of delegates at the Republican National Convention that the frontrunner should have won but didn’t.

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David Wasserman, of Cook Political Report, first noticed that two Trump delegates with South Asian names ran far behind delegates for his rivals.

In the Illinois loophole primary, there is rampant evidence Trump supporters gave fewer votes to Trump delegates w/ foreign-sounding names. — Dave Wasserman (@Redistrict) March 16, 2016

In the 6th Congressional District outside Chicago, two Trump delegates named Paul Minch and Barbara Kois won with more than 35,000 votes each.

A third Trump delegate candidate, Nabi Fakroddin, received just 30,639 votes – which allowed Pat Brady, a Kasich delegate and former state party chairman, to move past him and take the RNC slot.

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In the 13th District, a Trump delegate Doug Hartmann won nearly 32,000 votes and two Cruz delegates won nearly 31,000 votes to claim the next two slots.

Raja Sadia, a Trump delegate, garnered just over 24,000 votes.

Wasserman also noted that a Trump delegate with a black-sounding name received significantly fewer votes than two candidates named James Devors and Rita Gaus.

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Taneequa Tolbert will attend the RNC, but she received about 1,300 fewer votes than Devors and about 800 votes fewer than Gaus.