He isn't marginalizing them.  Obama's said he'd do whatever the DNC and the state decided.  The DNC said hold a revote and we'll seat your delegates.  Florida can't seem to get their stuff together and do it.  

That's not Obama's fault, and he isn't marginalizing them.  

Even so, I think at the end of the day they'll end up seated somehow.  

Now as far as winning Florida, if you're looking at current polling, it doesn't look like either of our candidates have a chance of winning that state.  As far as Obama's electoral map, it seems to consist of winning a number of purplish swing states that Hillary has written off, just like our last few losing presidential candidates.