It isn't like the entire party acquiesced, to be fair. Eisenhower considered him toxic. Margaret Chase Smith stepped up to the plate and openly questioned the entire bait --
>> I speak as a Republican. I speak as a woman. I speak as a United States Senator. I speak as an American.
...
It is ironical that we Senators can in debate in the Senate directly or indirectly, by any form of words, impute to any American who is not a Senator any conduct or motive unworthy or unbecoming an American -- and without that non-Senator American having any legal redress against us -- yet if we say the same thing in the Senate about our colleagues we can be stopped on the grounds of being out of order.
...
I think that it is high time for the United States Senate and its members to do some soul-searching -- for us to weigh our consciences -- on the manner in which we are performing our duty to the people of America -- on the manner in which we are using or abusing our individual powers and privileges.
I think that it is high time that we remembered that we have sworn to uphold and defend the Constitution. I think that it is high time that we remembered that the Constitution, as amended, speaks not only of the freedom of speech but also of trial by jury instead of trial by accusation. Whether it be a criminal prosecution in court or a character prosecution in the Senate, there is little practical distinction when the life of a person has been ruined.
Those of us who shout the loudest about Americanism in making character assassinations are all too frequently those who, by our own words and acts, ignore some of the basic principles of Americanism:
- The right to criticize;
- The right to hold unpopular beliefs;
- The right to protest;
- The right of independent thought.
The exercise of these rights should not cost one single American citizen his reputation or his right to a livelihood nor should he be in danger of losing his reputation or livelihood merely because he happens to know someone who holds unpopular beliefs. Who of us doesn’t? Otherwise none of us could call our souls our own. Otherwise thought control would have set in.
The American people are sick and tired of being afraid to speak their minds lest they be politically smeared as "Communists" or "Fascists" by their opponents. Freedom of speech is not what it used to be in America. It has been so abused by some that it is not exercised by others.
...
As an American, I am shocked at the way Republicans and Democrats alike are playing directly into the Communist design of "confuse, divide and conquer." As an American, I don't want a Democratic Administration "white wash" or "cover up" any more than I want a Republican smear or witch hunt.
As an American, I condemn a Republican "Fascist" just as much as I condemn a Democrat "Communist." I condemn a Democrat "fascist" just as much as I condemn a Republican "Communist." They are equally dangerous to you and me and to our country. As an American, I want to see our nation recapture the strength and unity it once had when we fought the enemy instead of ourselves. <<
-- "
Declaration of Conscience", June 1 1950, less than four months after McCarthy's infamous Wheeling speech in which he declared "I have in my hand a list of (pick a number, it changed in every version), which, whatever was in his hand, was never actually shown to anybody.
Here was one Republican -- and she named others at the end -- who had the cojones to stand on principles instead of a pandering bandwagon.