Yes, if 40% is the most a single candidates get.
Sorry, there's no rule that says "The winner of the election will be the one that gets the majority of the vote. If no one gets the majority, the candidate that angelo prefers is the winner."
I think run off elections are a good idea, the problem being in America there's so much problem with voter turn out and suppression that it would favor truly minority candidates.
Runoff voting would only serve to increase the turnout. I know it's in vogue to trot out the stupid-fat-lazy American trope, but most people don't turn out because they don't believe the system provides them with candidates they can get behind. This is in speaking to people from both parties - the consistent thread ends up being to vote for candidate X because the other party's guy would be terrible, not vote for candidate X because I like him. FPTP and winner takes all states practically ensure that.
And unlike Tristan - I'm not so hopeful about a shift to the left from the Ds. They'll likely see Sanders' support (and supporters) as failures and if anything I expect them to shift right even if the Rs implode due to a brokered convention/Trump 3rd party run.
This is the same party who implemented the Heritage Foundation's cap & trade and health care scheme, basically wholesale implementations of the R platform from the 90s, while simultaneously getting the shit kicked out of them by the Rs for being 'socialists'.
Ob la di, Ob la da - but I wouldn't ask any of these people to so much as negotiate a decent price on a used car for me.