People have said that before -- and have been proved wrong before. Before the election of 1860, abolitionists said it would make no difference whether Lincoln or a Democrat was elected. But millions of people were freed because that prediction was wrong.
In Germany, the Weimar Republic was nobody's idea of an ideal government and, in the desperate days of the Great Depression, no doubt many German voters thought that nothing could be worse. But they discovered during the dozen years of Nazi rule just how much worse things could be.
Congressional Republicans don't have enough votes to stop any legislation or confirm any judges, especially since the Democrats stick together, unlike Republicans. Moreover, with a Republican President saying that he wants both a bipartisan immigration bill and a bipartisan minimum wage bill, there is not even a hope of a veto.
But the fact that you cannot stop something does not mean that you have to become an accomplice. There is no reason why a majority of Republican Senators should ever again vote to confirm another extreme activist judge like Ruth Bader Ginsburg. Nor is there any reason why Congressional Republicans should again outrage their supporters by voting for another illegal immigration amnesty bill. Not unless they want to be chumps again in 2008.
Even aside from moral issues, betrayal has had a bad political track record under both the elder President Bush ("No new taxes") and the younger President Bush ("comprehensive immigration reform"). Congressional Republicans will have to face the voters again in 2008, even if President Bush does not.