[sellyme]

That's the trick: they didn't keep it at all. By the time that colour scheme arose, the Cold War was long finished.

The idea of colour-coding the parties at all didn't really become widespread until 1980, and the exact colours in use weren't standard until the aftermath of the 2000 election - ABC had initially used yellow for Republicans, and even as late as 1996 The Washington Post, Time, and NBC were all still using blue for Republicans and red for Democrats, in line with the colour schemes of most other nations.