Thirty-four votes.
From the Missouri Secretary of State:
Unofficial Election Returns
State of Missouri Primary Election – 2010 Primary Election
Tuesday, August 03, 2010State Representative – District 122 – Summary
Precincts Reporting 21 of 21
Grigsby, Gary DEM 1,052 49.2%
Osborne, Holmes DEM 1,086 50.8%McGhee, Mike REP 3,671 100.0%
Total Votes 5,809
State Representative – District 122 – County
Grigsby, Gary DEM
CASS 273
JOHNSON 329
LAFAYETTE 450Osborne, Holmes DEM
CASS 162
JOHNSON 153
LAFAYETTE 771McGhee, Mike REP
CASS 817
JOHNSON 1,142
LAFAYETTE 1,712
[emphasis added]
A primary race decided by thirty-four votes. And, of course, turnout sucked.