Dems used to win a lot of elections. They started losing elections when they started championing the causes that are of primary importance to the small slice of voters that would be considered 'far left'.

My biggest problem with the Democratic party is that they claim to be the party of the poor. They push government handouts, but do absolutely nothing to make sustainable changes in the lives of the poor. Giving people welfare and free healthcare is a temporary fix. Giving people the skills to get a job and be a contributing member of society is a permanent fix.
And therein lies the conundrum. When those people gain employable skills and see how large a chunk of their paychecks get taken in the form of taxes, many end up voting Republican. So the Democrats like to give just enough assistance to the poor to keep them poor Dem voters.

Don't get me wrong - the GOP has plenty of problems, but at least they don't masquerade that they're the party of labor when I've now lost the ability to strike thanks to Slick Willy ending the AMR strike in the late 1990s. None of the pilots of the four largest airlines will be able to go on strike thanks to Slick Willy: AMERICAN AIRLINE PILOTS STRIKE BUT CLINTON ORDERS THEM BACK - The New York Times