Off the top of my head I can think of cap and trade, as well as the individual mandate for health insurance. I’m sure there are more, and if you can add some more in for discussion that would be great! It’s a common meme among liberals that Republicans are now against these policies just because Obama is for them.
I have another theory My alternate theory is that they were NEVER in favor of these policies, but just threw them up as bullshit schemes that they could pretend to be in favor of in order to justify being against more liberal Democrat initiatives. They never expected to actually have to implement any of them – they knew the Dems would stymie their bills, just as they did to Dems bills. Now that Obama and the Dems have retreated to a fallback position of promoting the the old Republican bills as better than nothing at all, the Republicans are being forced to repudiate them without being able to publicly admit they never supported them in the first place. They are actually better off politically being viewed acting as obstructionists to Obama than being viewed as hypocrites who’ve been proposing straw-man bogus ideas for years before Obama was even a factor.