Roth was a Republican Senator for about 30 years. Before Roth, there was another Republican for over 20 years. Before Biden, there was a Republican. There is a lot of Republican tradition in Delaware.
There may be a “lot” of Republican tradition in Delaware, but the current crop of tools running the party are all RINOs. They have shoved the GOP into the hands of the DEM party. They hate Conservatives as much as the LIBs do.