I have noticed in politics that people are often willing to accept and/or rationalize something for a politician/party they support while the same act would be condemned for a politician/party they don't support ... As support for a politician/party falls you will see more and more petty complaints directed towards their actions until (eventually) people complain about politicians/parties doing the right thing.
While Obama is still far from hitting that point, now that his approval rating is in the 40% range he is no longer untouchable; and he will face more and more critical voices from people who believe he is being wasteful or acting in a way which isn't consistent with his current political message. In the case of the Bus, people are being critical because they believe he wasted taxpayer money on what is (really) a campaign expense and, while most informed people know it isn't this simple, they believe that pushing a jobs agenda while not making an effort to "Buy American" is inconsistent.







