Democrats ended up with Joe because the alternative was a lefty, Bernie, who would surely lose to Trump.
The same calculus applies today. Possibly win with cognitively challenged Joe, or lose with lefty Kamala Harris.
Joe was extremely unpopular in Iowa and New Hampshire.
Joe endeared himself to Iowans by calling them fat liars.
And he endeared himself to New Hampshireites by calling them lying dog-faced pony soldiers.
The common thread is the projection. It's Joe who is the liar, along with all his accomplices in the DNC and the media.
