So if the Democratic Party were smart, it'd capitalize on Bernie's rapport with independents, as well as young people, and try to replicate it across the board.
An obvious starting point would be adopting Bernie's positions on things like healthcare, Social Security, free college, no more stupid wars, and taking on Wall Street.
It's these positions, more than anything else, that have drawn people to the Bernie Sanders campaign and it's why his campaign has done so well despite all the nay-sayers in the establishment passing it off as "just another protest campaign."
Despite what some people might think about how important is to "have Democrats elect Democrats," closed primaries arguably hurt Democrats in the long run. They artificially limit the party's reach and don't give candidates any incentive whatsoever to win over anyone other than party loyalists.
Open primaries, on the other hand, do the exact opposite.
They also make it a lot easier for voters to take part in the political process because they're a lot easier to understand: if you're registered to vote, you can vote, regardless of the party you belong to. It's that simple.
In fact, a good way to synthesize open and closed primaries would be to have independent voters declare a party affiliation on election day at the polls to vote on that party's ballot, and then they're automatically registered with that party until they change their affiliation.
As the primary season winds to a close and we head towards the general election, Democrats should be optimistic.
No matter who's the nominee, the Bernie Sanders campaign has revealed an easy way for the Democratic Party to expand its base and therefore become, well, more democratic.
It's time for open primaries across the board.
Let's just hope the DNC is smart enough to realize that and make it happen.