Which is why his strategy has been to stop Trump from getting 1237, get as many as possible of his supporters be delegates (though "officially" bound to Trump) and hope for a 2nd ballot win.
If Trump takes Indiana, then those plans are futile.
I know his strategy. Even if it were successful, it makes no sense. The nomination of a deeply divided party would ensure defeat in November. Why is he still in the race? Why is Kasich still in the race? They are both nut cases on an ego trip.
Watch for surprises at the convention. Like Levin said last night, one is only a presumptive nominee if it appears he has at least 1237 going into the convention. The actual number won’t be known until after the first ballot by the delegates. That’s why the Cruz campaign is working the delegates...there could be enough no shows on the first ballot to fall short of 1237.