2020 elections

Casey Harlow / HPR

Former Hawaiʻi News Now general manager Rick Blangiardi announced Wednesday he is running for mayor of the City and County of Honolulu. He enters an already crowded mayoral race.

AP Photo/Mary Altaffer

PLYMOUTH, N.H. — Bounding onto a stage at a conference center in New Hampshire, tech entrepreneur Andrew Yang beamed a smile to a cheering crowd and launched into his pitch for votes heading intod of Tuesday's first-in-the nation primary.

Alex Brandon/AP

It’s been more than three years since Russia's sweeping and systematic effort to interfere in U.S. elections through disinformation on social media, stolen campaign emails and attacks on voting systems. U.S. officials have made advances in trying to prevent similar attacks from undermining the 2020 vote, but the potential threats have increased and some old problems have not been addressed. A look at what has changed since 2016 and what has not.