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ABC is already stating Trump has 996 delegates locked up as of today. So, just another 241.
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That's his soft count; his hard count (formally bound delegates only) is somewhere in the 960s, IIRC. I think his soft count may actually be something like 1,008. There are about 40 unbound delegates who have not committed either way, although most seem pretty cold towards Trump. Most of those who have committed are strong supporters of whoever they support and are unlikely to switch either way. The only group whose loyalties are in question are a bloc of the PA unbound delegates, who are supporting Trump on the first ballot, but are wishy-washy about that in some cases, and in pretty much all cases (or openly opposed) for subsequent ballots.
If Trump wins IN, the chances of him being stopped are small (not impossible, but definitely much reduced). If he doesn't, Cruz will still have his work cut out for him, especially with Kasich still around.