I think Arnold needs a much better "signature achievement"

Schwarzenegger keeps low profile in presidential race - San Jose Mercury News

It's also true that as Schwarzenegger looks beyond the end of his term in 2010, his future may well reside outside the realm of party politics, or at least the Republican Party. His signature achievement as governor is a first-of-its-kind plan to curb global warming, not exactly an issue associated with the GOP. If he wants to continue to work on environmental issues after leaving office, a high-profile role on behalf of the Republican nominee may not serve his interests.