The fundamental flaw in your reasoning is assuming that Democrats are a unified bloc. The Democrat party is a coalition of various ideologies, and their representatives are therefore representative of a wide array of ideologies. You'll note that those individual representatives absolutely vote how their constituents want them to.

Obama both tried to end Guantanamo and both of the wars. He was stopped by Congress. He tried to close Gitmo on literally his second day in office. He ended the war in Iraq and began the pullout of Afghanistan - but the country frankly was not ready for a pullout by the time of the Biden Admin, as history shows. Worth noting Biden was compelled by precedent and Afghani leaders to follow Trump's abortive pullout strategy.

Gitmo: https://www.google.com/amp/s/www.pbs.org/newshour/amp/show/obama-failed-close-guantanamo

Trump did try to put Clinton in jail : https://www.nytimes.com/2023/05/22/us/politics/fbi-clinton-foundation.html

I'm failing to see how you are showing any realistic examples of widespread lying.

Edit: for the record, and by way of demonstration of the "loose coalition," I would not support my Dem representative pushing a wealth tax. Wealth taxes don't work and are inefficient at best. I am a lifelong democrat, union activist, and climate lobbyist. We don't all agree on the same things. We aren't Republicans.

Also I think you're mixing up Republicans being dumb enough to think that cutting taxes reduces deficits with them being smart enough to lie about that.