This isn't an opinion, it is a fact.
"1. Romney’s the hardest working candidate in the race. After tediously tallying each campaigns events, I’ve found that Romney has held 493 events since January 7th. 50 more then his closest competitor, John Edwards. 92 more then McCain. 95 more then Obama. 125 more then Hillary. And a whopping 227 more then Rudy. "
Lackadaisical Fred Thompson has gotten off his rump only 74 times in the last 3 months.....big surprise.