Romney has had similarly kind words about the president as a father and family man. But most of their descriptions of each other during the campaign are far less complimentary, and that probably will be the case in the debate.
Romney accuses the president of having "more European than American" views. Obama says Romney has written off half the country.
The two do have a few similarities. They're both graduates of Harvard Law School; Romney also has a business degree from the Ivy League university. Each is a multimillionaire, though Romney's estimated $250 million fortune far exceeds Obama's net worth, which is as much as $8.3 million.
When people get one of their first looks at the rivals standing side by side Wednesday, they'll see a Republican who is 14 years older and an inch taller than the 51-year-old president, who stands 6-feet-1.
Obama and Romney first met in 2004 at a gathering of Washington's political and media elite. Romney, then governor, and Obama, a senator-elect from Illinois, were picked by the Gridiron Club to deliver speeches at the group's dinner. The private event's festive atmosphere, however, meant their dueling speeches were more about cracking jokes than outlining their policy differences.