If you are trying to suggest that because 50 years ago Southern Democrats were segregationist racists and, therefore today's Democrats are the party against civil rights, you are misrepresenting the truth.
Civil rights was not opposed by Republicans. The divide on civil rights was North v South and Republicans were mostly in the North.
This was the voting results on the 1965 Civil Rights Act:
The Senate:
-Southern Democrats: 1-20 (5%-95%)
-Southern Republicans: 0-1 (0%-100%)
-Northern Democrats: 45-1 (98%-2%)
-Northern Republicans: 27-5 (84%-16%)
As you can see, the one Southern Republican voted against it while all but one Northern Democrat voted for it. Among Republicans, five Northerners still voted against it.
What does this all have to do with Obama's Social Security number?
As an aside, Harry Truman's connection with the KKK was that he paid a$10 membership fee when arm-twisted. When a Klan officer demanded that Truman pledge not to hire any Catholics or Jews if he was reelected, Truman refused, and demanded the return of his $10 membership fee.
What has happened since was a reversal. The South is dominated by Republicans, who have, largely, the same attitude of the former Southern Democrats.
Reagan campaigned in the town where civil rights workers were murdered; BushI used Willy Horton to scare white people and Bush2 centered his campaign on anti-gay marriage sentiment.
On Reagan,
Bob Herbert wrote: