First lady Michelle Obama has been stepping up her public appearances – most recently with a Tuesday night appearance on “The Late Show with David Letterman” — and now, second lady Jill Biden is moving further into the spotlight, too.

In an interview airing Thursday morning on CNN’s “Starting Point,” Biden -- who this week is on a tour to promote her new children’s book, “Don’t Forget, God Bless Our Troops” -- tells host Soledad O’Brien that she believes the present-day GOP is “certainly not the Republican Party I grew up with.”

“I think that the parties are really disparate, and I think that probably the Republican Party has gone way far right than it has gone before,” Biden says, according to an advance excerpt of the interview.

As for the November election, Biden frames it — as most Democrats have — as a choice election rather than a referendum on President Obama.

“I think voters are going to have a clear choice,” Biden says. “Mitt and Barack are on totally different paths. You’ve got clear choices, that’s what I think. And, of course, I think our choice is the best and what Barack and Joe have done for Americans, and that’s the path I hope Americans choose.”

The CNN interview comes on the heels of an appearance by Biden on NBC’s “Today Show,” during which the second lady said she believed that her husband, Vice President Biden, “would make a great president.”

An earlier version of this story inaccurately said that Jill Biden was making a campaign trail appearance on “Starting Point.” It has been corrected to note that she is on a book tour.