There's absolutely no questioning Sanders' political leanings. Not only are her memoirs an homage to the outspoken president, but she chooses to take aim at his adversaries, specifically John Bolton, whom she described as "drunk on power (via NPR)." While both praising and supporting Trump, she also admits he "isn't perfect" and "isn't always easy." That's about as disparaging as her criticisms, if you can call them that get. Instead, she focuses on their continued friendship and the multiple promises he made to endorse her if she ever decides to run for office.
Sarah Huckabee Sanders appears to be a proud Republican who clearly has her sights set on a political career of her own, and her memoirs are both an endorsement for Trump for President in 2020, and a warning against voting for any other candidate. She vehemently urges, "A second term for President Trump would be better for all Americans than the Democratic alternative" (via The New York Times).