I don't think the TR quotes are THAT bad considering context of time and location. Yes, he definitely viewed whites as being superior, but here's the thing- until maybe the 1960s or 1970s, most people thought that in the US... and these quotes are from the 1910s.
I think he would be fine with Obama in context of the time period and racial advances.
An example of someone who would never accept a black President would be Woodrow Wilson or Andrew Johnson.
That article doesn't mention that Harry Truman was a staunch opponent of opposite race marriages.
It also doesn't even mention Ronald Reagan. If Lyndon Johnson is going to be called a racist for using the 'n' word as that site does (they call him a racist for this even though they acknowledge that he used harsh language frequently for almost everybody, as did Richard Nixon), then clearly Reagan should be included. In addition to almost certainly playing 'dog whistle' politics at his 1980 Presidential campaign launch in Philadelphia, Mississippi, he frequently brought up the myth of 'welfare queens driving limousines' (or whatever the exact expression is) along with bringing up at least one other lie about people on welfare that was almost certainly meant to be taken by the people's who vote he was seeking as being directed mainly if not exclusively at African Americans.
Also he was against the 1964 civil rights act after being for it and, as President, he virtually shut down the civil rights investigation division of the Attorney General's office.
There is little evidence that Reagan himself was personally racist, and there is that one famous story of him standing up to racism, but he was a (non southern) Democrat back then, but there was far less evidence presented on that site that Lyndon Johnson was personally racist.
Richard Nixon was likely personally racist, but, at least, he was an equal opportunity racist in that he seemed to hate practically everybody.