138.238.240.# (Howard University)- Washington DC
This seems to be the only visitor to fall in the timeframe to make these comments (unless this is yours which would make sense you would be on.) I know it isn't much, but it may help if you have future visitors or he uses a different name.
So he could be a black student with no girlfriend, thus too much time on his hands.
Or he could also be one of those Obama college indoc recruits.