It is easier to get better grades in Grad School than Undergrad, so if you have anything less than a Grad GPA of 4.0 you are conveying that you still can not excel academicly the way they want you to (it is irrelevant if you work full-time during Grad. School, have kids, or other responsibilities, etc. as showing you can excel is expected to be your main priority in their eyes).
I have a Graduate GPA of 3.48, although I work full time simultaneously, the Grad. Record hurts my application even further than my original Undergrad GPA of 2.8 from Michigan Engineering. Your undergrad institution and program are practically irrelevant to the Index Number and statistics that will enhance the school's average and image for the rankings while also deciding your fate.