If you're disappointed in Obama over the USA PATRIOT Act, that's your own fault - he was very clear about his opinions on USA PATRIOT from long before he ran for office, as early as 2003 (or 2006?). Obama has voted in favour of expanding/extending the USA PATRIOT Act's powers from the earliest possible time that he had US lawmaking influence.
There are many reasons to be disappointed in Obama perhaps, but he was clear about this from Day 1: He supports unchecked US domestic spying.
2007 — A Promise on the Road to the White House
By 2007, Obama is campaigning for the White House and making government transparency a central part of his platform. He tells an audience in Washington that the Bush administration “puts forward a false choice between the liberties we cherish and the security we provide.”
As president, Obama says, he will provide U.S. intelligence agencies the tools they need to defeat terrorists without undermining the Constitution. “That means no more illegal wiretapping of American citizens. No more national security letters to spy on citizens who are not suspected of a crime … No more ignoring the law when it is inconvenient.”
There were some options during the primaries (like Dennis Kucinich), and this is why the primary elections are so important. None of the No-to-USA-PATRIOT options made it past the primaries, so we were left without much real choice.
Oh, I didn't realise, it was the top result for my search. I'll fix it with a proper link soon, there are many legitimate sources for that data. Sorry about that.
Yes, Obama is a tremendous liar (not to mention a piss-poor president). However, Crypoz is correct. Obama didn't lie about this. He has always been for a centralized government and a police state. Of course, he flowers those words up and puts sugar on them to make them palatable to the masses, but he has stated he supports this type of intrusive government behavior all along.
To you defence, it was "Yes we can". Nothing about actually doing something. And the alternatives weren't really, hand-on-heart, any real alternatives, at least not within the two big parties.
There are many reasons to be disappointed in Obama perhaps, but he was clear about this from Day 1: He supports unchecked US domestic spying.
Citation: http://www.ontheissues.org/barack_obama.htm