If presumptive republican nominee Trump (after his Indiana primary win tonight) goes after the presumed democratic nominee (Clinton) starting tomorrow, the Democratic establishment may end up on that road as yet not traveled: the nomination of an insurgent candidate: Bernie Sanders.
If Trump exposes Clinton as a weak challenger against him, that could very well change the dynamic of the remaining Democratic primaries and a contested convention could well lead Sanders right into the White House. Remember, the last Dem primary is in June and the convention isn't until mid July... and who knows what else can happen between now and then.
If Sanders emphasis on a contested convention in his May 1st press conference was no accident . . . and he accessed a win for Trump as the end of Cruz’ campaign… staking out his position on a contested convention was sterling in both timing and strategy.
in effect, it puts Hillary in a vice.
The Huffington Post analyses it this way:
5 Reasons Bernie Sanders Wins Big with Cruz Dropout
1. News coverage for the Democratic primary, and thus Bernie Sanders, will increase exponentially — immediately.
2. Sanders will pick up a huge number of what would otherwise be Trump votes in states where voters are still able to register for upcoming Democratic primaries, or are able to cross over and vote in the Democratic primary due to being a registered independent.
3. Clinton will have to start spending a great deal of money to fight a two-front war against Donald Trump, who’ll begin his ultra-negative primary campaign against Clinton immediately, and Bernie Sanders ...
4. Sanders now has a greatly increased chance of winning all of the remaining Democratic primaries and caucuses.
5. The Democrats will have a contested convention, and the Republicans won’t.