David mentioned in a billboard.biz article!

Billboard.biz:
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Idols who have reached No. 1 on the Christian charts include Clay Aiken, Mandisa, Chris Sligh, Jason Castro, Kris Allen and Underwood.

Kimberley Locke was the first Idol to reach No. 1 on the dance charts, followed by Clarkson, Jennifer Hudson, Jordin Sparks, Blake Lewis and Adam Lambert.

The Adult Contemporary and Adult Top 40 charts have also been dominated by Idols. Clarkson was the first to top charts in both formats, followed by Daughtry. Locke has three AC No. 1s, all with holiday songs. Underwood has also topped the AC charts, along with Elliott Yamin, David Cook, Sparks and David Archuleta, while Allen and Lambert have reigned on the Adult Top 40 charts.

In an unbroken string dating back to season one, which premiered on Fox-TV 10 years ago tonight, every Idol winner (see list below)  has had at least one No. 1 on the Billboard charts, from Clarkson to Phillip Phillips, winner of season 11. His version of  "Home" debuted on top of the Rock Digital Songs chart two weeks ago.

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American Idol No. 1s by contestant
Kelly Clarkson 73
Carrie Underwood 62
Chris Daughtry (Daughtry) 38
Fantasia 31
Ruben Studdard 16
Jennifer Hudson 15
Mandisa 15
Clay Aiken 12
Adam Lambert 9
David Cook 8
Kimberley Locke 8
Scotty McCreery 7
Josh Gracin 7
Jordin Sparks 7
Kris Allen 4
David Archuleta 4
Kellie Pickler 4
Elliott Yamin 4
Taylor Hicks 3 American Idol Finalists 2
Bo Bice 2
Jason Castro 2
Bucky Covington 2
Blake Lewis 2
Chris Sligh 2
Paris Bennett 1
Diana DeGarmo
1 Lee DeWyze 1
Tamyra Gray 1
Phillip Phillips 1
William Hung 1

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