WASHINGTON, D.C. - Presumptive Democratic presidential nominee Joe Biden and his newly named running mate, California Senator Kamala Harris, made their first joint appearance on Wednesday.

Near Biden’s home in Wilmington, Delaware, the duo promised a progressive but unifying agenda if they are elected in November.

“I have no doubt that I picked the right person to join me as the next vice president of the United States of America, and that’s Senator Kamala Harris,” Biden said.

Their first joint appearance comes 24 hours after the Biden, the former U.S. vice president from 2009-2017, named the California senator his running mate, ending months of speculation.

Harris is the first African-American woman named a major political party’s vice president.

“I am incredibly honored by this responsibility, and I am ready to get to work,” Harris said.

Analysts believe there is a lot gain from naming Harris as V.P.

“He needed somebody who would be ready on day one,” said Todd Belt, the director of the Political Management program at The Graduate School of Political Management at George Washington University.

Harris was among nearly a dozen Democratic senators, governors, and other politicians under consideration for the vice-presidential nomination. But, Harris, 55, checks all of the boxes Biden, 77, and the party were looking for, according to Belt.

“If you’re older, you want somebody younger,” Belt said. “If you have foreign policy experience, you want somebody with domestic policy experience. If you’re from the East, you want somebody from the West.”

But, there are some political risks to selecting Harris, including if the Democrats are trying to win over moderate voters in swing states. For example, Harris supports Medicare-For-All and has suggested stricter gun regulations, even though she herself is a gun owner.

“Certainly people who are opposed to her will call her opportunistic,” Belt said. “One of the things biggest things that her campaign failed at during the election was defining her in terms of her policy proposals.”

Now, both the Republican and Democratic tickets are now set with each party’s political conventions set to start over the next two weeks.

A scaled-down, mostly virtual Democratic National Convention will kick off first in Milwaukee, Wisconsin, starting on Monday.