Stopped torture? The enhanced interrogation techniques from the Bush administration are completely still in force. Obama mostly is Bush's third term, with the flaws magnified and a liberal cover.
As you could guess, I don't support him politically. Oppose is too strong a word, since I actually think he's not been a complete disaster and, well, you gotta give the president something of the benefit of the doubt, no matter who he is. But as for reasons...
1. Wasted nearly a trillion dollars on an ineffective stimulus. If you're a Keynesian it was too small to do enough good, and if you're not it was an irresponsible splurge that we haven't even gotten pretty high schools and decent roads out of, as happened during the Great Depression.
2. Obamacare. Something needed to be done, but certainly not this. I'll admit my eyes glaze over when health care comes up in a discussion, but the mandate part of this plan is chilling. If the government can fine citizens for NOT engaging in an activity then we don't have limited government any more.
3. Libya. Unconstitutional, unnecessary war. Even Bush got Congressional permission for Afghanistan and Iraq. Even if you agree with the decision to got into Libya, Obama's actions in keeping Congress out of the loop totally and relying solely on international organizations to legitimize the intervention is a disgrace. He can schmooze the Arab League but can't be bothered to go to Congress? Even when he'd almost certainly get their full support? Jesus, he campaigned against doing things like this! It's a scandal.
4. Is a Sox fan.
5. Israel-Palestine. Although he was mostly right on what Israel needs to do for there to be peace, his speeches and policy on the issue has been so hamfisted (settlement freeze, 1967 borders) that the peace process has been frozen for 2 years and we are now on the cusp of the UN voting to admit Palestine. Israel needs to stop building settlements and the 1967 borders need to be the base for a Palestinian state, but you don't talk about those things outside of the negotiating room since demagogues on both sides will go nuts. Obama thought he could bring peace just by being Obama, and instead has made it even more elusive.
6. Syria. Why is our ambassador still there?
I could go on. He seems like a nice enough guy and I truly believe he has the nation's best interests in mind on almost everything (like any president, reelection always influences some stuff), but on balance I don't think he's been very good for the country. He's done some good stuff and I respect him, but I do not want him back for 4 more years. We should think of him more like the first George Bush than Jimmy Carter.