Vice President Kamala Harris stumbled while trying to push back Wednesday against critics of President Biden’s likely re-election bid as she took a post-State of the Union tour of morning TV. Harris, 58, told ABC “Good Morning America” anchor George Stephanopoulos that Biden, 80, is fit to serve another term, even as polling shows most Democrats think the party should nominate another candidate in 2024. “I mean, George, I think that age is more than a chronological fact, to be very frank with you,” Harris told Stephanopoulos while touting Biden’s purported accomplishments. “It’s about, um, thinking about, ah, whether we...