Did you know that Sesame Street hasn't had a Republican based Personality Guest Star since Laura Bush in 2003? Then prior to that - it was Barbara Bush in 1990.
Where as Democrat guests are basically every other episode. These include Jill Biden, Hillary Clinton, Mr and Mrs Obama on separate occasions, Sonia Sotamayor...
Then there's the Hollywood Democrat Machine as well.
Neil Patrick Harris, Sarah Jessica Parker, Steve Carell, Jamie Lee Curtis, Jim Carrey, Whoopi Goldberg, Tom Hanks, Viola Davis, Liam Neeson, Ian McKellen, John Legend, Jon Hamm, and Bill Hader and many many many more.
Then there's topics that lean liberal - like Big Bird tweeting to get vaccinated, Cookie Monster tweeting about Shrinkflation, having Gay and Transgender Individuals head line an entire episode, even making fun of Donald Trump with a muppet named Donald Grump.
The people making the decisions have decided to lean to the left & black list conservative guests. So what the children get out of that - is Left Leaning talking points that shape them into Democrats by planting seeds of Democrat ideas.
That kind of bias is literally what propaganda is.