Rasmussen is not a great polling organization. They’ve had Biden at 49% or higher and remember they had Biden ahead in their final poll for Florida? https://www.rasmussenreports.com/public_content/politics/elections/election_2020/florida_biden_48_trump_47
The trend is your friend. While Rasmussen may be overstating Biden support, he is doing so consistently, asking the same questions, day after day, for the past several years.
Rasmussen likes to focus on strong likes and dislikes. In his first term the “like deficit” was about 10 percentage points toward the negative.
With these statistics, Obama was able to win in 2012. Of course, it is quite likely that he cheated, just like Biden this time!