(CNN) -- As Mitt Romney prepares to make the case for a first term, give a thought to what we can expect from a Barack Obama second term. 

It's probably going to look a lot like the second terms of George W. Bush, Bill Clinton, Ronald Reagan, and Richard Nixon -- driven not by his own agenda, but by events beyond his control. Bush's second term was defined by the after-effects of the Iraq decision he made in his first term; Clinton's by impeachment and the Internet boom; Reagan's by deficits and Gorbachev; Nixon's by Watergate. 

And what will define Obama's? 

1) Republicans will hold at least one House of Congress, maybe two. 

2) The U.S. economy will continue to mend, as the financial crisis recedes into the past. 

3) Unless forcibly prevented, Iran will enrich enough uranium for multiple nuclear weapons sometime before 2017. 

4) Natural gas production will continue to surge. 

Prediction 1 implies that there will be no bold Obama legislative agenda in a second term. The votes just won't be there. The second-term Obama agenda will have to be executed through agency action and executive order. And he'll have lots of opportunities via the big laws passed in his first term: the Affordable Care Act, Dodd-Frank, and so on. 

Critics often talk about how long these laws are. Yet however long the enactment, the text of a complex modern statute is only the very roughest guide to its future operation. The crucial operating decisions are made by presidential appointees, supervised by the courts. Congress drafts, but the administrators fill in the details - and the details, as the saying goes, are where the devil lurks. 
How many things does the article list that will define Obama's?
4)