In politics, a racer is a believer in the big evil conspiracy of tea partiers, conservatives, libertarians, and moderates who disagree with the policies of Barrack Obama and/or seek freer market solutions to economic problems (supposedly a well hidden conspiracy, since you won't hear/see any evidence of this at a typical tea party event). The conspiracy is basically that this ideology is all, mostly, or centrally revolving around race, rather than economic policy (which they actually talk about on a regular and primary basis).
Racers' supposed evidence includes:
1) The president is black, so if you disagree with him you must be a white racist.
2) There are a lot of white people at tea party events (although more blacks and latinos than, say, a Green Day concert or a G20 protest, drawing great speculation on those groups' obviously racist roots).
4) Profit. (Dismissal of rational and historically/economically astute argument.)
Origins: Much like other single-issue 21st century political conspiracy theories, the word is a conjunction of a single theme or platitude with "er." Like "truther" (9/11 truth conspiracy theorist) "birther" (Obama birth certificate conspiracy theorist) and "deather" (Bin Laden death conspiracy theorist), we now have "racer" (tea party race conspiracy theorist).
Contessa Brewer of MSNBC ranted about a man at a tea party event with an AR-15 slung over his shoulder, tying it into dangerous white racism and saying it's because there's a black man in the white house. It was while airing a video of the man edited (cropped) to not show his face or hands.. and as it turns out the man was black, and like most tea partiers not dangerous and not very concerned about the race of the president. ... Contessa Brewer is definitely a racer.