But don't forget, Obama changes positions more often than Jenna Jameson (Jamison? I'm not going to Google to check the spelling, I'm trying to eat breakfast). Also, he objects to the tax-on-mileage, not to GPS units in private vehicles reporting to the government (hmm...why aren't there GPS units in government-owned vehicles, as a means to prevent/prosecute government employees abusing public resources?).
And individual states are still considering the scheme.