Here are the "worst" losses for the last few years (just based on kempom ranking):
2001-2002:
222 Western Carolina L, 66-64
2002-2003:
207 Green Bay L, 68-64
2003-2005:
145 Oregon St. L, 87-82
142 UMKC L, 93-52
2004-2005:
134 Rutgers L, 76-66
2005-2006:
160 Missouri L, 74-71
2006-2007:
139 New Mexico L, 78-54
2007-2008:
86 George Mason L, 87-77
2008-2009:
157 Oregon L, 75-70
2009-2010:
74 Iowa St. L, 85-82
2010-2011:
73 Oklahoma St. L, 76-62
2011-2012:
115 Oklahoma L, 82-73
115 Oklahoma L, 63-60
2012-2013:
51 La Salle L, 63-61
2013-2014:
248 Northern Colorado L, 60-58
2014-2015:
189 Texas Southern L, 58-56