Don't you mean, "how come President Obama can't amass the unpopularity of governors"?
Getting elected Governor of some states is fairly easy if one is the pick of some powerful machine. One says the right things to urban crowds or to special interests, and one gets elected. Governors so elected may well fit the political culture of a State, get along well, not stir up problems, and get their political careers set in stone. They might be hacks, but they are the right hacks.
Governors who enter office with a desire to make sweeping reforms (not all reforms are good -- just ask about Rick Scott and Rick Snyder) step on well-entrenched special interests and those special interests bite back. Those with a missionary desire to reshape the political climate of their states discover to their surprise that the people don't want their values changed.
Some are just simply incompetent (Brownback, R-KS). Some get caught in an economic downturn that makes governing a difficult process of imposing budgetary cutbacks even upon supporters. Some who stick around long enough (Perry, R-TX) find that voters increasingly notice their deficiencies. Some (Corzine, D-NJ) fall far short of their promises. Some (Blagojevich, Crook-IL; Sanford, AWOL-SC) do something so egregious that they become laughing stocks or jailbirds.
Were I to give advice to a Governor, I would say
1. Act in accordance with the Cook PVI of the State.
2. Don't sell out to out-of-state interests.
3. Ignore ideological think tanks.
4. Act with integrity.
5. Don't use inflammatory rhetoric about opposing interests.
6. Quit while you are ahead.
7. Don't try to change the political climate of the state.
No particular order here.