The party line in right-wing media outlets is that while President Joe Biden, now 81, is in a state of mental decline, likely 2024 GOP presidential nominee Donald Trump, who is 77, remains youthful and energetic. But Biden’s defenders have countered that in fact, the president has been a much better and more disciplined speaker — especially during his aggressive, fiery 2024 State of the Union speech. And Trump, they note, has had more than his share of verbal stumbles in 2024, including confusing former South Carolina Gov. Nikki Haley with former House Speaker Nancy Pelosi (D-California). In a…