Largely I don’t see what Obama can do to reduce racism. Racism is a disease of the heart and mind. It’s nurtured so early in childhood in the family home, in school, in the neighborhood, in the social settings that parents drag their kids to, even church. It’s reinforced throughout the years. Peer pressures can compound it further in the teenage years. Etc, etc. However, there are things that would help . . . . .
Federal legislators should work tirelessly to pass laws that standardize anti-discrimination behavior throughout all the states. They should not be satisfied with the federal laws that are already on the books but ones (for example) related to voting rights, and gerrymandering, etc., etc. Not only can the states not be trusted to do the right thing, they have no right to choose discriminatory practices in the first place. This whole notion of States’ Rights as a holy untouchable concept is such crap. Back when the Constitution was penned one can understand the need they saw for a Senate structured as they wrote it but things have changed (for example) populations are extremely mobile now unlike back then and the Senate no longer is the guardian of the minority it is now ruled by the minority through the filibuster. If the main function of the Senate has, in reality, morphed into preserving a State’s “culture” then we’re now operating like the Sunnis and Shiites. Additionally, through gerrymandering the House in no way represents the will of the people; again it is ruled by the minority. Abolishing the stacked decks through legislation could not cure racism but it would help make racism harder to practice.
Then there is commerce. Certainly corporations don’t want black and brown co-mingling with their daughters but they don’t mind at all having black and brown dollars co-mingling with their investments. People who are discriminated against must realize the tremendous value and power of their collective wealth. Overwhelmingly corporations have no loyalty to white when it comes to profit. Negative impact on the bottom line sends intolerable pressure through the system. The 1955 Montgomery, Alabama bus boycott seriously impacted not only the bus company financially but the shop keepers of Montgomery as well. This year we saw business interests such as the California Chamber of Commerce and the National Association of Manufacturers pressure the GOP to switch-up and pass immigration reform because businesses want the cheap labor. Currently this is a huge resource that goes untapped in any meaningful way.
Another is the already “browning of America”. This cannot be stopped and cannot be reversed. We are not a nation of just one race, or two races or three races. As far as I know we are the most racially, culturally, religiously, etc. diverse country on the planet. What are the chances that we’re going to give up our highly developed palate for multi-national cuisine? No way, even places like Texas and Wyoming have Thai restaurants. Also extremely important is the birth of inter-racial babies, this cannot be over emphasized. The more bi-racial citizens inhabiting the neighborhoods of America the more racism will suffocate. Praise Jesus. This is a long term process but so goes the definition of evolution.
Power to the People
Port Tack 
Of the various valuable points you reference, it appears to me that voting for all is most important. If we had a national voting ID law to either have a DMV drivers license or DMV ID card for all voters, this would take the confusion out of which type of ID is valid or not. It would for the most part eliminate voter fraud concerns. It would be something like the new health care law, where all people get insured, for voting all people have one of these two IDs.
The people who make voters stand in long lines, intimidate voters, or otherwise make it difficult to vote, well I don’t see how they can look at themselves in the morning without cringing and knowing their actions to be abusive.