Since FDR Democrats were perceived as a working man’s party...and there was much less liberal nonsense to get in the way of that.
Plus, as I understand it House elections were *very* locally focused back then. They weren’t so much about national politics but what the Congressman could bring back home to his district. Democrats with their spendy ways were always naturally going to fare better in that situation.
The brilliance of the Newt Gingrich revolution in the mid-1990s was that he nationalized the House races by writing a Contract with America and saying if you voted for Republicans this is what we are going to for the country *as a whole*. He flipped the focus from local politics to national politics (and I think we see that still continuing today with, for example, Democrat House candidates running against Trump).
Fascinating so Newt Gingrich broke their chokehold on the House at least.
Shame it wasn’t cemented but he can take great credit for it.
“FDR Democrats were perceived as a working man’s party.”
The spread of those lies can largely be blamed on the media, especially the print media pre-TV. That lie is similar to the lie that the KKK is/was a GOP invention when it actually was created by the RAT party as its Thug Arm.