If you’re wondering why marijuana legalization wasn’t brought up at the first Democratic debates, you’re not alone.

While the drug war and some related issues came up (as Marijuana Moment captured), the issue of marijuana itself didn’t come up. And presidential candidate Sen. Cory Booker (D‑NJ) wasn’t happy about that.

“I am absolutely disappointed that wasn’t an issue when you see voters turning out this issue all over the country,” Sen. Booker told Business Insider.

Booker has been a champion of marijuana reform in recent years. Earlier this year, he reintroduced his Marijuana Justice Act, which would remove cannabis from the list of federally-prohibited substances, expunge marijuana convictions, and reinvest money into communities affected by the War on Drugs. During a CNN Town Hall in March, Booker said that ​“the War on Drugs has been a war on people…we fundamentally have different laws in this country, that are treating people differently.

Of course, with 21 candidates spread out over two nights, it’s not surprising that some policy issues had no time to shine. As the field of candidates thins out as the Democratic party heads into primary season, expect to see much more discussion of cannabis legalization and reform from Booker — and many others.