Certainly the more Nader, Greens, the Socialist party, the Communist party, the Worker's World party, and the Socialist Worker's party draw Democrat support, the more Democrats will push to far left socialism in policy. Rather than trying to move back to middle to get the moderates, they will continue to pursue the far left wackos. Even without Ralph Nader's Green Party votes in Florida, Albert Gore Junior could have won with the Socialist/Communist vote in Florida.
The Republicans may pick up more votes from moderates as a result or they could move even more to the left, away from conservativism, as the "center" moves more to the left.
At some point we need to be holding Republicans to the party platform and ousting the CINOs and RINOs in the primaries.