Might can do it.

source: 
LAGS
Entry: 
271
Example: 
Might can do it.
Modal 1: 
might
Modal 2: 
can
Gender: 
Male
Race/Ethnicity: 
Black
Age: 
22
Level of Education: 
Technical school (Some)
Home Community, Town, or State: 
LA (New Orleans)
Location Collected: 
LA (New Orleans)
Year: 
1977
Relation to Addressee: 
subject to fieldworker
Medium: 
Spoken
Sentence Structure: 
1.0
Status: 
Naturalistic