The New York Times shows 43 competitive Congressional districts. 270 to
Win shows 68 districts as a toss-up back in 24. Both show Montana’s western district as competitive.
270 to Win showed 197 Congressional seats safe for whatever Republican is running, and 170 safe Democrat seats. The distance between the parties isn’t so great as it seems – six of the nine California districts labeled as toss-up are occupied by dems, and when you Gerrymander correctly, you put the opposing party in districts that are 70 or 80% their party, and your own party gets districts that are 55%.
Still, if the 270 numbers are correct, the Republicans need only 21 non-competitive seats to control Congress in every election.
Rant.Com show this map to see the most Gerrymandered states. They show that the Republicans have been better at Gerrymandering than the Democrats:

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