Several reasons. 1. First of all, he is trying to "redeem," himself. We all know you don't "redeem" yourself by being a conservative. You "redeem" yourself by standing up to conservatives and being progressive. 2. Look back at before all that happened. A lot of Freepers felt he was not conservative in the first place. 3. To the extent he was conservative it was because his wife was in charge. His wife was the brains. Without her, he is just a sub-80 IQ idiot. Now he hates her, he's going to reject her political philosophy. 4. He feels that he was wronged by what happened. He has an ax to grind against Republicans. Unfortunately, that will express itself against conservatives. 5. He tries to justify bad behavior. Enough said. 6. A real conservative who made a mistake like he did would not seek to get back into politics. He or she would do the decent thing, and move on to other projects in life. They would realize this is not in the best interest of their family, or anyone. You don't have to live of the government your entire life. But Sanford does. 7. His desire to get back into politics and all his behavior demonstrates, selfishness, and an, "the world is all about me." Does that sound like a conservative or a lefty?
There are probably more reasons. How many reasons do you need? He was barely acceptable back when. Now he is completely unacceptable. It's better to have a real conservative in 2016, then to be stuck with this egotistical left wing dirt-bag for 30 years.