If the game is FOXMW, then it is blacked out on ESPN/ESPN-2. It's kind of a pain that you can't watch the HD Sunday Night Baseball on ESPN and are stuck with HD.
But, several Cards games are on in HD on FSNMW, and they aren't blacked out in Cards territory. The main problem is that the territory is so large that fans in areas like Oklahoma have to sub to the MultiSport package to get FSNMW, because our default RSN is FSNSW.
And Sunday Night Baseball should never be on the FSN. It's exclusive to ESPN, so it should never be blacked out. Monday-Saturday, yeah - blackouts on ESPN.