You managed to find the poll question that gives Affirmative Action every possible break and puts in into the best possible light and still 50% oppose it. If you ask the question “Do people support special preferences for blacks and Hispanics in education and employment the results are 70% against. Such as the results at http://www.pollingreport.com/race.htm

“Which comes closer to your view about evaluating students for admission into a college or university? Applicants should be admitted solely on the basis of merit, even if that results in few minority students being admitted. OR, An applicant's racial and ethnic background should be considered to help promote diversity on college campuses, even if that means admitting some minority students who otherwise would not be admitted.”
Solely Race/ Unsure
Merit Ethnicity,

ALL 69 27 4
Non-Hispanic whites 75 22 3
Blacks 44 49 7
Hispanics 59 36 5

Of course you are asking for something that does not exist. However, is there every anytime in the law that groups can be punished for being part of a group or that a group can be rewarded for being part of a group. Jennifer Gratz was punished by the State of Michigan for being white. Even the U.S. Supreme Court ruled that her civil rights were violated. You could interpret that the 14th amendment does allow for discrimination as long as due process was followed. Then you need to find an example of where affirmative action was used where due process was provided to the whites (and these days Asians) who were discriminated against.

Favor: 51
Oppose: 42
Don't Know: 8
(Whites 44/48/8; Blacks 80/13/6; Latinos 73/21/6).

That being said, “in polling data” is a non-sequitur to “throw away the constitution”. And I already have a standing challenge, as yet unanswered, asking for any evidence that the 14th amendment was originally intended/meant/understood to be color-blind.

Most blacks who could vote in the 1950's were voting for Democrats. They were the party in power, Even those in the South. The real question is why does government sanctioned discrimination against whites attract black voters? Is it because they benefit from the heavy hand of the government.

Also, in polling data, most Americans are against Affirmative Action and Quotas. I guess that most progressives are ready to throw away the constitution is it helps their political ambitions.

Besides there is nothing that the Republicans can do to attract black voters. The Republicans could come out for something as blatnatly unconstitutional are reparations that blacks would still vote 90% for Democrats. My guess is that most blacks have never voted for a Republicans in any election. Part of black culture is voting Democratic, there is nothing the Republicans can do about it.

McCain flips on affirmative action, announces support of Arizona plan which would ban the program.

I guess he wants to make sure that no black people ever vote for him.

There is no mystery why Republican's do so poorly among minorities. They'll need a serious day of reckoning before things change. Remember that the Democrats had to cede the South for decades in order to turn their image around among blacks.